WordPress: What is this CMS?

What is WordPress?

WordPress is the most widely used content management system in the world. Created in 2003 by Matt Mullenweg and Mike Little as a fork of the b2/cafelog blogging software, WordPress has evolved over the years to become a versatile platform capable of powering blogs, corporate websites, online stores (via WooCommerce), and even web applications. Written in PHP and using MySQL or MariaDB as its database, WordPress is distributed under the GPL license.

WordPress's historic strength lies in its democratization of web publishing. Before WordPress, creating a website required significant technical skills. WordPress made content creation accessible to millions of non-developers through its intuitive admin interface, visual theme system, and plugin ecosystem that adds functionality in just a few clicks.

In 2018, WordPress introduced Gutenberg, a modern block editor replacing the classic TinyMCE editor. Gutenberg allows composing pages by assembling content blocks (text, images, galleries, columns, etc.) visually. This evolution brings WordPress closer to modern site builders, although the transition sparked controversy within the community.

Why WordPress matters

WordPress's domination of the CMS market is an undeniable fact. Understanding its strengths and weaknesses is essential for making informed technology decisions, particularly when an existing WordPress site reaches its limits.

• Dominant market share: WordPress powers over 40% of the global web. This ubiquity means an immense developer pool, abundant documentation, and thousands of available themes and plugins.
• Non-technical accessibility: a user without development skills can install WordPress, choose a theme, add plugins, and publish content within hours. This ease of access has been the driver of its massive adoption.
• Plugin ecosystem: the official directory hosts over 60,000 free plugins. From SEO (Yoast) to e-commerce (WooCommerce), forms (Gravity Forms), and security (Wordfence), there is a plugin for virtually everything.
• Global community: WordCamps, meetups, and forums bring together an active community of millions of developers, designers, and content creators worldwide.
• Affordable hosting: WordPress runs on any shared PHP hosting for a few euros per month, making it the most economical solution for starting a website.

How it works

WordPress follows an architecture based on a PHP core that handles HTTP requests, interacts with the MySQL database, and generates HTML pages. The theme system controls the visual presentation of the site, while plugins add additional functionality. This three-layer architecture (core, themes, plugins) is both WordPress's strength and weakness.

The "hooks" system (actions and filters) is WordPress's central extensibility mechanism. Actions allow executing code at specific moments in the lifecycle (page load, article publication, user login), while filters allow modifying data before it is displayed or saved. This system enables plugins to modify WordPress behavior without touching the core.

The Loop is WordPress's fundamental mechanism for displaying content. It is a PHP loop that retrieves posts matching the current query and displays them according to the active theme's template. Custom post types and custom fields extend this system to handle custom content types beyond simple posts and pages.

The WordPress RESTAPI, introduced in version 4.7, exposes WordPress content and functionality via JSON endpoints. This API enables using WordPress as a headlessCMS, where the WordPress backend provides data while a separate frontend (React, Vue.js, or other) handles presentation.

Real-world example

The official White House website (whitehouse.gov) long ran on WordPress. TechCrunch, BBC America, Sony Music, and millions of other sites use WordPress to manage their content. These examples show that WordPress can support high-traffic sites when properly configured and optimized.

A common scenario involves an SME that starts with a simple WordPress site, then sees its needs evolve: complex customizations, integrations with internal systems, insufficient performance under load, security issues related to plugins, and updates that break functionality. It is at this stage that the question of migrating to a more robust solution arises.

At KERN-IT, we regularly help companies migrate their WordPress site to Wagtail, a modern CMS built on Django and Python. This migration preserves the ease of content editing while providing a clean architecture, enhanced security, superior performance, and unlimited extensibility through the Python ecosystem.

Implementation

1. Installation: download WordPress from wordpress.org and deploy it on a PHP server with MySQL. Many hosts offer one-click installation.
2. Configuration: choose a theme suited to your industry and configure general settings (title, permalinks, languages). Use a child theme to customize without risking overwrites from updates.
3. Essential plugins: install an SEO plugin (Yoast SEO), security (Wordfence), cache (WP Super Cache or W3 Total Cache), and backup (UpdraftPlus) as a minimum base.
4. Content: create your pages and posts with the Gutenberg editor. Use reusable blocks and page templates to ensure visual consistency.
5. Optimization: configure caching, compress images, enable CSS/JS minification, and use a CDN for performance. WordPress requires these optimizations to deliver acceptable performance.
6. Maintenance: regularly update the core, themes, and plugins. Security vulnerabilities in outdated plugins are the primary source of WordPress site hacking.

Associated technologies and tools

• WooCommerce: e-commerce extension that transforms WordPress into an online store, used by millions of sites.
• Elementor / Divi: visual page builders that enable creating complex layouts without code.
• ACF (Advanced Custom Fields): essential plugin for creating custom fields and structuring content.
• Yoast SEO: SEO plugin that guides editors in optimizing their content for search engines.
• PHP: the programming language on which WordPress is built.
• MySQL / MariaDB: database systems used by WordPress to store content and configuration.

Conclusion

WordPress democratized web creation and remains a relevant choice for simple sites, blogs, and small online stores. Its dominant market share guarantees a rich ecosystem and unmatched resource availability. However, for businesses whose needs go beyond basic content publishing, WordPress's limitations become evident: technical debt from plugin accumulation, security vulnerabilities, degraded performance under load, and difficulty implementing complex business logic. For these organizations, migrating to a modern CMS like Wagtail, built on Django and Python, offers a clean architecture, native security, superior performance, and the power of the Python ecosystem for AI, data, and automation. KERN-IT offers a comprehensive migration service from WordPress to Wagtail, preserving your existing content while modernizing your technical infrastructure.