Blog is space to put the output in writing of any thought or expression. The activity of expressing such thought or opinion or any other type of expression given in writing is called blogging. It is an interactive way of keeping your presence in the web. It allows people to respond or comment back on the blogs hence opens an avenue for your interactive presence in the web. It is generally an activity of single person to maintain a blog.
The blog can be on any subject such as your hobby or your travel experience or your any other interest on a journal on any other area. It is completed as a blog when the written expression is published in the web.