[jQuery] How do get the ID of an element that has been clicked ?

[thought]

Hi all.
This might be more of a javascript problem rather than a jquery
problem,
but I'm also wondering if there is a 'jquery way' of solving it.

Given this code:

<DIV id="div_one"></DIV>
<DIV id="div_two"></DIV>
<DIV id="div_three"></DIV>
<DIV id="div_four"></DIV>

Lets say that the user is invited to click one one of these divs.

How do I get the id of the div that was clicked ?

Thanks.