What is a Blog and how to create a Blog?

I see many people here who still do not get to know what a blog is or why is it used and what is it purpose in the internet world  , well I am here to teach you people what blog is exactly used 

Here you will get to know where as 

1. What is a Blog ?
2. How do I create a Blog?
3. What is the advantage of blogging? 
4. 6 Tools That Help Bloggers Manage and Monitor Their Online Reputation