A blog is a website where entries are written in chronological order and displayed in reverse chronological order. "Blog" can also be used as a verb, meaning to maintain or add content to a blog.

Blogs provide commentary or news on a particular subject such as food, politics, or local news; some function as more personal diaries. A typical blog combines text, images, and links to other blogs, web pages, and other media related to its topic. The ability for readers to leave comments in an interactive format is an important part of many blogs.