Jquery .addClass() and .removeClass() used to add or remove CSS class dynamically in the Html element.
For Example
.addClass()
$(‘#p1′).addClass(‘cssclass1’);
Add a “cssclass1’ css class to elements that contain id of “p1″.
.removeClass()
$(‘#p1′).removeClass(‘cssclass1’);
Remove a “cssclass1’ css class from elements that contain id of “p1″.