what <aside> tag do..though it is similar to the <p> tag..?Then what is the difference..?

Answer 1

http://www.html5andcss3.org/html5aside.php

Answer 2

In aside tag you can put the relative or non relative link where as in <p> tag you put all the relative information about the blog, post or heading.

Answer 3

you can compare div and aside tag together.
both are almost same.