How WordPress Works: A Beginner’s Guide to the CMS

WordPress is the software behind a large share of the websites you visit every day, currently estimated at over 40% of all sites online. Despite that scale, plenty of people who want a website have never quite understood what WordPress actually is or how it works under the hood. This guide explains it from first principles.

What is WordPress?

WordPress is a content management system, or CMS: software that lets you create and manage website content without writing code for every page. Instead of building an HTML file for each page of your site by hand, you write and edit content through a dashboard, and WordPress handles turning that content into a working website.

It started in 2003 as a blogging tool, but has grown into something far broader. The same underlying software now powers everything from personal blogs to large business sites, online stores, membership platforms, and online courses, largely thanks to its plugin and theme ecosystem rather than changes to WordPress’s own core.

How WordPress actually works

At a basic technical level, WordPress consists of two main parts working together: the WordPress software itself (written in PHP) and a database (typically MySQL or MariaDB) that stores your content, settings, and user information. When someone visits your site, the web server runs the WordPress PHP code, which queries the database for the relevant content, and assembles a finished web page to send to the visitor’s browser.

This is different from a fully static website, where each page is a pre-built file. WordPress pages are generated dynamically, which is what makes it possible to manage content through a dashboard rather than editing files directly, but it’s also why WordPress hosting benefits from good server performance and caching: each page view involves some computation, not just serving a file.

Three things make up most WordPress sites: core (the base WordPress software, which handles the dashboard, content storage, and basic functionality), themes (which control how your site looks), and plugins (which add functionality, from contact forms to online stores to SEO tools). You can change your theme or add plugins without touching the underlying core software, which is what gives WordPress its flexibility.

What WordPress is commonly used for

• Blogs and personal websites: WordPress’s original use case, still well-suited to publishing posts, organising them by category, and managing reader comments.
• Business websites: Company information, services, portfolios, and contact forms, often built on a theme with minimal custom development.
• eCommerce stores: With the WooCommerce plugin, WordPress becomes a fully functional online store, handling products, payments, and inventory.
• Membership sites: Plugins like MemberPress let you restrict content behind a membership or subscription.
• Online courses: Plugins such as LearnDash add course structures, quizzes, and student progress tracking.
• Forums and communities: Plugins like bbPress add discussion forum functionality directly to a WordPress site.

Why so many people choose WordPress

A few genuine advantages explain WordPress’s popularity rather than just its size. It’s free and open source, so there’s no licence cost for the software itself (you’ll still pay for hosting, and optionally for premium themes or plugins). It’s flexible: the plugin ecosystem means you can extend it for almost any purpose without starting from scratch. And it has a large community, which means abundant documentation, tutorials, and support, along with a steady stream of updates and security patches from a wide developer base.

The flip side of this flexibility is that a poorly maintained WordPress site, running outdated plugins or an unmaintained theme, can become a security or performance liability. Keeping core, themes, and plugins updated is genuinely important, not just a generic piece of advice. If you ever find yourself dealing with a compromised site despite these precautions, our step-by-step guide to recovering from a hacked WordPress site walks through exactly what to do.

What WordPress needs from hosting

Because WordPress runs as PHP code querying a database on every page view, your hosting needs to support both. The practical minimums are a current PHP version (WordPress recommends 7.4 or higher, though newer versions perform noticeably better), MySQL 5.6 or higher or an equivalent MariaDB version, and HTTPS support via an SSL certificate. Beyond these baseline requirements, the things that make a meaningful difference to a WordPress site’s day-to-day performance are server-side caching, SSD storage, and a host that keeps PHP and database software reasonably current rather than leaving you on years-old versions.

For a fuller breakdown of what to look for in WordPress hosting specifically, see our guide to web hosting for WordPress sites.

FAQs about how WordPress works

Is WordPress the same as WordPress.com?

No, and this is a common point of confusion. WordPress.com is a hosted service built on the WordPress software, where the company manages hosting for you, with various tiers and limitations. The self-hosted version (sometimes called WordPress.org, after where you download it) is the software itself, which you install on hosting of your choice, giving you full control but requiring you to handle hosting yourself.

Do I need to know how to code to use WordPress?

No. Day-to-day content management, writing posts, adding pages, uploading images, is done through a visual dashboard with no coding required. Some coding knowledge becomes useful if you want to customise a theme beyond what’s possible through its built-in settings, but it isn’t necessary to run a typical WordPress site.

Why does my WordPress site need a database?

All of your content, posts, pages, comments, user accounts, and most settings, is stored in the database rather than as separate files. This is what allows WordPress to dynamically assemble pages and makes content management through the dashboard possible, but it also means database backups are just as important as file backups when protecting your site.

Getting started

Switchweb’s hosting includes one-click WordPress installation, current PHP versions, and server-side caching as standard. View our WordPress hosting plans to get started.