WordPress started in 2003 with a single bit of code to enhance the typography of everyday writing and with fewer users than you can count on your fingers and toes.
Since then it has grown to be the largest self-hosted blogging tool in the world, used on millions of sites and seen by tens of millions of people every day.
What You Can Use WordPress For
WordPress started as just a blogging system, but has evolved to be used as a full content management system and so much more through the thousands of plugins and widgets and themes, WordPress is limited only by your imagination.
Extracts from wordpress.org