On the Internet, a blog (short for weblog) is a personal journal that is frequently updated and intended for viewing by the general public. Blogs generally represent the personality of the author or reflect the purpose of the Web site that hosts the blog.

Topics sometimes include brief philosophical musings, commentary on Internet and other social issues, and links to other sites the author favors. The essential characteristics of the blog are its journal form, typically a new entry each day, and its informal style. Additionally, many blogs enable visitors to leave public comments, which can lead to a community of readers interacting with the author and anyone else who might have left a comment.