Why is used after multiple floating DIVS in a container DIV?

Question

I have encountered a

at many places, but I am not aware why is it done? Can someone brief me on this, why it is used in

Answer 1

It is to clear out floating styles.

clear: http://www.w3.org/wiki/CSS/Properties/clear

float: http://www.w3.org/wiki/CSS/Properties/float