WordPress is the behemoth in the content management industry. Powering 38.5% of the top 10 million websites
, and with 63.5% market share amongst other Content Management Systems, nothing else comes close to it.
WordPress was released in 2003 as simply a blogging engine, and while it retains blogging as a focus, it's taken on all tasks of Content Management Systems in general - many sites built with WordPress these days do not include a blog.
WordPress.org differs from WordPress.com in that WordPress.com is the version hosted by the WordPress organization. WordPress.org (the version we concentrate on here) is self hosted, so hosting managed by the website owner, and has far more freedom for customization than WordPress.com.
WordPress is customized via Themes
. Themes are used to tailor the design, and practically speaking, any design is achievable. Thousands of pre-built themes are available, many free themes are available on WordPress.org and elsewhere, but also plenty of premium themes from marketplaces such as ThemeForest
or Elegant Themes