"Blog" means "web log."
Some people use blogs as a journal. They document things that go on in their lives, be those important or trivial things.
Have you seen the movie Julie and Julia? Julie kept a food blog - each post was a kind of journal entry about her experience cooking Julia Childs' recipes.
You can add pictures and videos to your blog. I started a blog after my son was born. We were living in Virginia at the time, so the blog allowed me to share stories, pictures, and videos of my son with his grandparents who lived far away.
