WordPress Hosting Glossary: Every Term You Need to Know

Hosting providers love jargon. Their marketing pages are packed with acronyms and technical terms that sound impressive but are meaningless if you do not already know what they mean.

This glossary cuts through that. Every term is explained in plain language with context about why it matters for your WordPress site.

A

A Record

A DNS record that points your domain name to a specific IP address (your server). When someone types your domain name, the A record tells the internet which server to connect to. You update A records when migrating to a new host.

AVIF

A modern image format that offers better compression than JPEG and WebP. AVIF files are smaller at equivalent quality, which means faster page loads. Browser support has become widespread, making it a viable format for WordPress sites in 2026.

B

Bandwidth

The amount of data transferred between your server and visitors over a period of time. Every page load, image download, and file transfer uses bandwidth. Most managed WordPress hosts include generous or unlimited bandwidth. Budget hosts may throttle your site if you exceed bandwidth limits.

Brute Force Attack

An attempt to gain access to your site by systematically trying username and password combinations. Most managed WordPress hosts include brute force protection that limits login attempts. On shared hosting, you need a security plugin to handle this.

C

Cache / Caching

Storing a copy of generated content so it can be served faster on subsequent requests. Instead of WordPress building a page from scratch every time, the cached version is served directly. There are multiple caching layers: page caching, object caching, browser caching, and CDN caching. For a detailed explanation, see our guide on how to configure WordPress caching.

CDN (Content Delivery Network)

A network of servers distributed worldwide that caches your static assets (images, CSS, JavaScript) and sometimes full pages. When a visitor in Singapore requests your image, it is served from a nearby Asian server rather than your origin server in the US. Kinsta includes Cloudflare-based CDN on all plans. SiteGround includes CDN as well.

CLS (Cumulative Layout Shift)

A Core Web Vital metric measuring how much your page layout shifts unexpectedly during loading. An image loading without reserved dimensions causes surrounding content to jump. Target: under 0.1. See our guide on optimizing for Core Web Vitals.

Core Web Vitals

Three metrics Google uses to evaluate page experience: Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). These metrics influence search rankings and are directly affected by your hosting quality. See why hosting speed matters for SEO.

cPanel

A popular web hosting control panel that provides a graphical interface for managing your server, domains, email, databases, and files. SiteGround uses a custom version called Site Tools. Most managed WordPress hosts have replaced cPanel with their own dashboards.

D

DDoS (Distributed Denial of Service)

An attack that floods your server with traffic from many sources simultaneously, overwhelming it and causing your site to go down. Managed hosts include DDoS protection that absorbs attack traffic before it reaches your server. Shared hosts generally do not provide this protection.

DNS (Domain Name System)

The internet’s phone book. DNS translates human-readable domain names (yoursite.com) into IP addresses (192.168.1.1) that computers use to find servers. DNS propagation after changes (like a migration) can take up to 48 hours, though it usually completes within a few hours.

E

Edge Caching

Caching your full HTML pages on edge servers close to visitors, not just static assets. Traditional CDN caches images and CSS on edge servers but still requests the HTML from the origin. Edge caching serves the complete page from the nearest edge location. Kinsta implements this through Cloudflare.

F

FTP / SFTP

File Transfer Protocol (FTP) and its secure variant (SFTP) are methods for uploading and downloading files to and from your server. SFTP encrypts the connection, making it secure. Always use SFTP over FTP. All managed WordPress hosts support SFTP.

G

Git

A version control system that tracks changes to your code over time. Git deployment means pushing code changes from a Git repository directly to your server. WP Engine supports Git push deployment. Kinsta and Cloudways support Git pull from the server.

H

HTTP/2 and HTTP/3

Protocols that govern how web browsers and servers communicate. HTTP/2 introduced multiplexing (loading multiple files over a single connection). HTTP/3 uses the QUIC protocol for even faster connections, especially on mobile networks. Most modern managed hosts support HTTP/2, and HTTP/3 is becoming standard.

HTTPS

HTTP with encryption (SSL/TLS). HTTPS protects data transmitted between the visitor’s browser and your server. It is required for SEO (Google flags HTTP-only sites as “Not Secure”), payment processing, and user trust. All managed WordPress hosts include free SSL certificates for HTTPS.

I

INP (Interaction to Next Paint)

A Core Web Vital metric measuring how quickly your page responds to user interactions (clicks, taps, key presses). Poor INP is usually caused by heavy JavaScript blocking the browser’s main thread. Target: under 200 milliseconds.

IP Address

A numerical address assigned to your server on the internet (e.g., 192.168.1.1). Your domain name points to this address through DNS. Shared hosting means multiple sites share one IP address. Managed and dedicated hosting often provide dedicated IP addresses.

L

LCP (Largest Contentful Paint)

A Core Web Vital metric measuring how quickly the largest visible element (usually an image or heading) loads on your page. This is the metric most directly affected by your hosting’s server response time. Target: under 2.5 seconds.

Let’s Encrypt

A free, automated certificate authority that provides SSL certificates. Most hosting providers use Let’s Encrypt to provide free SSL. The certificates auto-renew every 90 days.

LiteSpeed

A high-performance web server that is an alternative to Apache and Nginx. LiteSpeed includes built-in caching technology (LiteSpeed Cache). A2 Hosting uses LiteSpeed servers on their Turbo plans.

M

Managed Hosting

Hosting where the provider handles server administration, security, backups, updates, and optimization. The opposite of unmanaged hosting, where you handle all server maintenance yourself. See our full explanation of what managed WordPress hosting is.

Memcached

An in-memory caching system used for object caching. It stores database query results in server memory for faster retrieval. Similar to Redis but with fewer features. WP Engine uses Memcached on lower-tier plans.

Multisite

A WordPress feature that allows running multiple sites from a single WordPress installation. All sites share the same codebase. Useful for networks of related sites. Not all hosts support Multisite; Kinsta, WP Engine, and Pressable explicitly support it.

N

Nginx

A high-performance web server commonly used by managed WordPress hosts. Nginx is faster than Apache at serving static files and handling concurrent connections. Kinsta, Cloudways, and many other managed hosts use Nginx.

Node.js

A JavaScript runtime used for server-side applications. Relevant for headless WordPress setups where the frontend is built with React, Vue, or Next.js. WP Engine offers Node.js hosting through their Atlas platform.

O

Object Caching

Caching database query results in memory (using Redis or Memcached) so WordPress does not need to query the database repeatedly for the same information. Critical for WooCommerce stores, membership sites, and any site with dynamic, database-heavy content.

Origin Server

Your actual web server where WordPress is installed. This is distinct from CDN edge servers that cache copies of your content. When the CDN cache expires or misses, it fetches fresh content from the origin server.

P

PHP

The programming language WordPress is built with. Your server runs PHP to generate WordPress pages. PHP version matters for performance: PHP 8.2 and 8.3 are significantly faster than older versions. Always run the latest PHP version your plugins support.

PHP Workers

The number of simultaneous PHP requests your server can process. Each page view that is not served from cache uses a PHP worker. When all workers are busy, requests queue up, causing slow page loads. This metric is especially important for WooCommerce and membership sites where many pages bypass caching. See our guide on choosing hosting for WooCommerce.

R

Redis

An in-memory data structure store used for object caching in WordPress. Redis is faster and more feature-rich than Memcached, supporting persistent connections and more data types. Kinsta offers Redis on all plans. Cloudways includes Redis as a server option.

S

SLA (Service Level Agreement)

A contractual guarantee from your hosting provider, typically about uptime. A 99.9% uptime SLA means the host guarantees your site will be available 99.9% of the time (allowing about 8.7 hours of downtime per year). If the host fails to meet the SLA, you may receive account credits.

SFTP

See FTP / SFTP above.

SSL (Secure Sockets Layer) / TLS

Encryption protocols that secure the connection between a visitor’s browser and your server. TLS is the modern successor to SSL, but the term “SSL” is still commonly used. An SSL certificate enables HTTPS. All managed WordPress hosts include free SSL.

Staging Environment

A private copy of your live site where you can test changes safely. Updates, design changes, and new plugins can be tested on staging without affecting your visitors. Most managed WordPress hosts include one-click staging. See our guide on setting up staging environments.

T

TTFB (Time to First Byte)

The time between a browser sending a request and receiving the first byte of the response. TTFB includes DNS lookup, TCP connection, TLS handshake, and server processing time. A good TTFB is under 200ms. TTFB is primarily determined by your hosting provider and caching configuration.

U

Uptime

The percentage of time your site is accessible. Expressed as a percentage: 99.9% uptime allows approximately 8.7 hours of downtime per year. 99.99% allows about 52 minutes. Managed WordPress hosts typically guarantee 99.9% or higher.

V

Varnish

An HTTP accelerator that caches web pages in memory for fast delivery. Cloudways uses Varnish for page caching. Varnish sits in front of your web server and serves cached pages without invoking WordPress or PHP.

VPS (Virtual Private Server)

A virtualized server with dedicated resources (CPU, RAM, storage) carved from a physical server. A VPS provides more resources and isolation than shared hosting but less than a dedicated server. Cloudways provides managed VPS-like hosting on cloud infrastructure.

W

WAF (Web Application Firewall)

A security system that monitors and filters HTTP traffic between the internet and your WordPress site. A WAF blocks common attack patterns like SQL injection, cross-site scripting, and known exploit attempts. Kinsta includes a Cloudflare-based WAF. WP Engine offers WAF through their Global Edge Security add-on.

WebP

A modern image format developed by Google that provides better compression than JPEG and PNG. WebP images are typically 25-35% smaller at equivalent quality. Widely supported by all modern browsers. Most image optimization plugins convert images to WebP automatically.

WP-CLI

A command-line interface for managing WordPress. WP-CLI lets you update plugins, manage users, export content, and run database operations from the terminal without using the WordPress admin dashboard. Essential for developers and available on all managed WordPress hosts.

X

XML-RPC

An older WordPress API that enables remote communication with your site. Used by the WordPress mobile app, Jetpack, and some third-party tools. Also a common target for brute force attacks. If you do not use tools that require XML-RPC, disabling it improves security. See our guide on securing WordPress hosting.

This glossary covers the terms you will encounter most frequently when researching and using WordPress hosting. If you are new to hosting entirely, our guide on what managed WordPress hosting is provides a broader overview of how it all fits together.