Padding may refer to any of the following:
1.Padding is a term used to describe the process of filling a field with pad characters. For example, if a name field required ten characters and your name was "Bob" (3 characters) the field would be "Bob0000000" where the 0's are the padding characters.
2.Padding is white space immediately surrounding an element or another object on a web page. The picture below helps demonstrate the difference between padding and a margin when working with CSS. As can be seen, the padding is within the border, and the margin is outside the border. For example, with a table cell, cellpadding can be added to the <table> tag to add white space around the text in a cell.