Open Source Software
WordPress is an Open Source software which allows it to be used free of cost. You can use it on any kind of personal or commercial website without have to pay a single dime for it. It is built on PHP/MySQL (which is again Open Source) and licensed under GPL.
You don’t really have to be experienced to use WordPress on your website. Nowadays most of the hosting companies provide the ability to install WordPress on your site at a single click of the mouse. The administration section is easy to navigate and its even easy to add articles/content to your website.
You will never run short of templates when using WordPress. If you don’t like the themes that come with the default installation of WordPress, you can hunt on the Internet and you will find thousands of free themes that you can download and use for your website. There are themes which can even make your website look like a regular site instead of a blog.
Plugins Extend Functionality
WordPress plugins allow you to do just about anything that you want and can be installed in a jiffy. For example, you want to paginate your blog posts, just look on Google and you can easily find the relevant plugin that will easily do the job for you.
WordPress is one software that follows all the Web Standards and keeps your blog or website compliant to all the rules that have to be followed when running a website.
Search Engines have to be definitely kept in mind when building a website. WordPress uses different functions which allow it to be search engine friendly. For example sending pings to other sites, making categories, tagging your posts, use of h1/h2 tags etc.
Large community Support
As per recent statistics, WordPress is used on more than 1% of the websites on the Internet in the world. There is a large user community backing the development of this software. So, whenever you face any problems, you can go through all the available WordPress forums and communities and find answers for all your questions.
So, you see the benefits of using WordPress now? And, you can add to this list by providing your feedback in the comments.