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WordPress can be (and is) used for any kind of site, regardless of size or complexity. Some common use-cases include:
Single-page landing sitesSimple company sites with just a few pages. These sites are usually rarely updated and are essentially static sites with an administration aspect.Simple, single-user blogsComplex news sitese-Commerce sitesFull-fledged CMS solutionsPart of the success of WordPress is because it is extendable, hookable, and can be used and tweaked to accomplish almost any task on the web.
However, one aspect of WordPress has never changed, regardless of the increase in WP’s use cases and popularity: The database. WordPress requires MySQL/MariaDB to be installed on a site. MySQL is arguably only optimal for some of the scenarios: The “mid-tier” range of site types.