According to Wikipedia, WordPress was used by more than 26.4% of the top 10 million websites by April 2016. That’s more than a quarter of the world’s websites, including this one.
You can use it to run a blog or even a whole website, whether or not that website includes a blog.
In WordPress jargon, ‘posts’ go on your blog (one long page with the most recent post at the top), and ‘pages’ are static.
There are thousands of options so you can make your site look and behave exactly as you want. But it’s a target for hackers. If you don’t want to unexpectedly find your site selling Viagra or promoting the Bristol Gerbil Society, it’s wise to do regular updates that add the latest security patches.
There are two flavours of WordPress. Both are free. Yes, free! Confusingly, both have the same name.