WordPress is the most popular platform for blogs. It started as a simple way to host a linear collection of posts, but over time has grown into a full content management system. A robust collection of plugins and themes makes it easy to run an entire website with WordPress alone, without having to rely on other platforms.
It is possible to host a WordPress blog directly on wordpress.com, but these days most people prefer to download the stand-alone version and install it on their own hosting. It’s available for free and without ads.