“Blog” is short for “weblog”, which refers to a log of events that is kept online. Over time, “blog” has become the go-to term for online articles presented in a reverse-chronological or diary format. Entries are called “posts” and they are shown so that the latest post is found at the top of the page.
The word “blog” can also be used as a verb. For instance, to blog about something is to write a post about it and publish it online. Doing this is referred to as “blogging” and the people who do this are called “bloggers.”