A blog is a website or section of a website that is regularly updated with written content, typically by an individual or a group of individuals. These posts can cover a wide range of topics, such as personal experiences, news, reviews, tutorials, and more. Blogs often allow readers to leave comments and interact with the blog's author(s). They can be created for personal or professional use, and can be used to share information, promote a cause or business, or express one's thoughts and ideas.