Blog (short for web log) is a personal website that features information or commentary on any subject. Entries posted on a blog appear in reverse chronological order and may include any, all, or some combination of text, photos, videos, audio, as well as hyperlinks (links to websites or other Internet-based information). And one of the more useful features of blogs is their interactivity-they are designed to facilitate interaction by permitting readers to comment on entries. So blog is a platform of personal media, knowledge management tool, and community forum.