WordPress is an open-source content management system (CMS) that allows users to create and manage websites easily. It powers over 40% of all websites, making it the most popular CMS in the world.
Why use it?

User-friendly: No coding experience needed to start building a site.
Flexible and Customizable: With thousands of themes and plugins, you can customize your site to suit your needs.
SEO-Friendly: WordPress is optimized for SEO and allows easy integration with popular SEO plugins.
Active Community Support: Being open-source, it has a large global community for support and updates.