It is nothing but a term used to represent an element with it's properties. According to the CSS box model, a browser engine
represents every element as a box. The
all together represents a box that wraps around every html element.
|Content||The content of the box, where text and images appear|
|Padding||Clears an area around the content. The padding is transparent|
|Border||A border that goes around the padding and content|
|Margin||Clears an area outside the border. The margin is transparent|