A blog is an online journal. Many blogs provide commentary or news on a particular subject; others function as more personal online 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. Most blogs are primarily textual, although some focus on art (artlog), photographs (photoblog), sketchblog, videos (vlog), music (MP3 blog), and audio (podcasting) and are part of a wider network of social media. Micro-blogging is another type of blogging that consists of blogs with very short posts. The most popular blogging software is WordPress. It is also often used for non-blog sites as well.