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

To sum it up, it's like telling the browser to not allow anything (i.e., any element be it a div, span, anchor, table etc) either on the left or on the right of the previous element. This will make the next element move to the next line.