WordPress is an open source content management system (CMS) that allows users to create a website or blog from scratch, or to improve an existing website. WordPress has an extensive and freely available library of themes and plugins that allow users to customize their websites to their own specifications.
However, WordPress does not come with any free themes, and users are required to purchase and install third-party themes to create a custom website or blog. Although there are a few free themes available, these are generally limited in features and may not be suitable for all users.
Overall, WordPress is an effective and popular platform for creating custom websites and blogs. However, users are required to purchase and install third-party themes to gain the full range of customization options available in WordPress.