what is a Blog ?
A blog is a personal diary. A daily pulpit. A collaborative space. A collection of links. Your own private thoughts. Memos to the world.
Your blog is whatever you want it to be. In simple terms, a blog is a web site, where you write stuff on an ongoing basis. New stuff shows up at the top, so your visitors can read what's new. Then they comment on it or link to it or email you.
Source :
www.blogger.com
"Bloggers give you information and point of view. In return you give them your attention and intellectual energy. They gain influence by drawing your eyes; you gain information by lending your eyes. They become well-known and influential; you become entertained or informed. They get something from it and so do you." — Peggy Noonan, Opinion Journal