The pushStack() method works by ACCEPTING an array of DOM elements and pushes them into a stack. This is done so that call to methods like .end() and .andSelf are able to behave correctly. The jquery internally uses this method to keep TRACK of all the previous COLLECTIONS of jquery while using a chain traversing method. Good examples of such methods COULD be .parents() and .filter().

For example:

// select some divs
$('div.container')
// find some spans INSIDE those divs and add a class to them
.find('span').addClass('baby')
// pop those spans off the "stack",
// returning to the previous collection (div.container)
.end()
// add a class to the parent of each div.container
.parent().addClass('daddy');

The pushStack() method works by accepting an array of DOM elements and pushes them into a stack. This is done so that call to methods like .end() and .andSelf are able to behave correctly. The jquery internally uses this method to keep track of all the previous collections of jquery while using a chain traversing method. Good examples of such methods could be .parents() and .filter().

For example:

// select some divs
$('div.container')
// find some spans inside those divs and add a class to them
.find('span').addClass('baby')
// pop those spans off the "stack",
// returning to the previous collection (div.container)
.end()
// add a class to the parent of each div.container
.parent().addClass('daddy');