What is the use of div in html and what is the meaning of it?

Answer 1

The <div> element is a block-level element that is often used as a container for other HTML elements.
When used together with some CSS styling, the <div> element can be used to style blocks of content:

Answer 2

The div is a block element meaning the element which is contained in full of the screen width by default. We use it to separate sections of a document. It is definitely the most used element in html (yet)