Introduction
WordPress can be all or part of many things, apply as required. Please select from the following for more information on each.
WordPress is an open-source web application
WordPress is a state-of-the-art publishing platform
WordPress is a Content Management System
WordPress is a blogging engine
WordPress is a web application platform
WordPress is a templating system
WordPress Features
The following are the key features of WordPress, the full feature list is more suitable for a book …
Huge WordPress Community support base

With an install base of several MILLION web sites, WordPress has a large support base within its user and developer community. WordPress is an Open-Source Project, with thousands of developers working on all aspects of WordPress’ future.
Rapid Deployment – easy installation and upgrades

Wordpress is easy and and quick to install and configure – we can get a web site up and running in a couple of hours. Upgrading from previous versions and other software is a piece of cake. Try it and you’ll wonder why all web software isn’t this easy.
Powerful sorting and search capabilities

WordPress has a powerful internal search engine that makes searches for any instance of word or phrase easy. Your visitors can also sort content via the tags or categories assigned to your posts.
Full standards compliance

The developers of WordPress have gone to great lengths to make sure every bit of WordPress generated code is in full compliance with the standards of the W3C. This is important not only for interoperability with today’s browser but also for forward compatibility with the tools of the next generation. Your web site is a beautiful thing, and you should demand nothing less.
Make changes to your layout without rebuilding

Changes you make to your templates or entries are reflected immediately on your site, with no need for regenerating static pages.
Page Management

Pages allow you to manage non-blog content easily, so for example you could have a static “About” page that you manage through WordPress. This can scale to hundreds of pages which are organized alphabetically, by parent page affiliation or by numerical sort order. As you create, modify, move or delete pages, page menus are automatically updated.
Link Management

Links allows you to create, maintain, and update any number of blogrolls through your administration interface. This is much faster than calling an external blogroll manager.
WordPress Themes and Template System

WordPress comes with a full theme system which makes designing everything from the simplest blog to the most complicated webzine a piece of cake, and you can even have multiple themes with totally different looks that you switch with a single click. Have a new design every day.
Cross-blog communication tools
Ability to allow/disallow Visitor’s Comments
Spam protection
Advanced user registration and security
Password Protected Posts
Easy Importing from other Blog/CMS software
XML-RPC interface
Enhanced Work-flow Control
Typographical niceties
Intelligent text formatting
Bookmarklets
Ping away
Who uses WordPress?
Because of WordPress’ built-in flexibility, it is used by a wide variety of web sites – from Fortune 500 companies to personal bloggers. For the ever evolving “Who’s Who” list that uses WordPress, see the WordPress Showcase