Blog is short for web log. Wikipedia defines a blog as "a website where entries are written in chronological order and displayed in reverse chronological order."
Run by an individual or a group, blogs typically feature text, photos and links to other sites. Some include audio or video files. Blogs are generally updated regularly, often by way of a journal entry, and many allow readers to post comments. Some families put up pictures and updates about their activities on blogs so that loved ones who live far away can stay in touch.
In recent years, blogging has also become extremely popular among young people. Recent studies reveal that nearly half of all blogs are now authored by teenagers who use their sites to network with their friends.