WordPress comes with several powerful and easy to use functionality. It offers a feature set on par or better than any other software of its kind. You can rest assured that with WordPress you will be on the cutting edge of the technology available. There are literally hundreds of plugins that extend what WordPress does, so the actual functionality is nearly limitless
With WordPress, you can easily build standards-compliant websites. Whether you need to use XHTML, HTML 5 or follow accessibility standards, such as W3C WAI or Section 508, WordPress will help you.
Visitors to your site can leave comments on individual entries, and through Trackback or Pingback can comment on their own site. You can enable or disable comments on a per-post basis.
Out of the box WordPress comes with very robust tools such as an integrated blacklist and open proxy checker to detect and eliminate comment spam on your blog.
WordPress has a built-in user registration system that (if you choose) can allow people to register and maintain profiles and leave authenticated comments on your blog. You can optionally close comments for non-registered users. There are also plugins that hide posts from lower level users.
You can have types of users that can only post drafts, not publish to the front page
WordPress highly advanced user system allows up to 10 levels of users, with different levels having different (and configurable) privileges with regard to publishing, editing, options, and other users
The widgets give more power to end users and lower the workload of developers. Widgets are components that can be placed onto pages and they provide static, dynamic or interactive content, such as on-line form, list of the latest news, newsletter subscription box etc. Widgets allow users without technical knowledge to create parts or even whole pages without any technical knowledge.
WordPress helps you build search engine optimized websites that can be easily indexed by Google and other search engines, and as a result are ranked higher in search results. Achieving a good search result ranking is an effective way to organically increase your website traffic.