A blog (from Web log) is a Web site with regular entries , somewhat like a diary. It describes events or provides commentary on a particular subject.
A blog can be more than text. It can have include graphics, video, photos and sound as well. Readers are often allowed to interact and leave there own commentary.

Below are free blogs that you can sign up for to create your own blog. The first listed is from google.

https://www.blogger.com/start

http://www.thoughts.com/free-blog