A blog is an online journal where you write your thoughts, reviews, opinions, anything that comes to mind. Some blogs are all about product reviews, some are about difficulties the person is facing (for instance an illness) or even just about everyday life. On my blog I writ about everyday life now and about my survival of childhood abuse. You can create a free blog at www.blogger.com and all the instructions are there. Basically you sign up, open a link for a new post and put down what you want to write about. Once you hit publish it's out there for everyone to see so be careful what you post.