The word blog is the short term for Web log. It is journal that is available on the web and is usually maintained by an individual, with regular entries of commentary, descriptions of events, or other material such as graphics or video. The entries to the blogs are displayed in chronological order showing the most recent additions.
Blogs provide commentary or news on a specific subject, others use blog as a personal online diaries. A blog combines text, images, and links to other blogs, Web pages, and other media related to its topic. Blog readers have the ability to post comments in an interactive format. Most blogs are in textual presentation, but there are some blogs that are focus on art (artlog), photographs (photoblog), sketches (sketchblog), videos (vlog), music (MP3 blog), audio (podcasting), all of which are part of a wider network of social media.
Common features of a blog are: 1. It has a main content area, wherein articles are listed chronologically, with the latest article on top. Most often, articles are arranged by categories. 2. It has an archive section to keep older articles. 3. It allows people to leave comments about the articles. 4. It provides a blogroll, a list of links to other related sites. It often located at the sidebar on the page or featured as a separate web page. 5. It has one or more "feeds" like RSS, Atom or RDF files. It allows feedreaders to access a site automatically and look for new content and post updates.