WordPress is a free software, this means you are free to download, install, use and modify it. You can use it to create any kind of website. It is also open source which means the source code of the software is available for any one to study, modify and play with. WordPress is easy to use and learn. WordPress have a detailed step-to-step guide for the users WordPress Tutorials. WordPress is flexible and can be extended its functionality by using plugins. There are thousands of free themes and plugins.
For my personal reason, I can use WordPress to start my own business. it is a good window and channel to let people know what is my business.