jQuery Tutorial plus Question:

The each() function specify the function to be called for every matched element.

Syntax:
$(selector).each(function (index, element))
"index" is the index position of the selector.
"selector" specifies the current selector where we can use "this" selector also.
In the case when we need to stop the each loop early then we can use "return false;"

For example:
$("#clickme").click(function(){
$("li").each(function(){
document.write($(this).text())
});
});
This will write the text for each "li" element.