Would anyone mind explaining what this code is doing?

I don't like using code I don't understand, I'm trying to wrap my head around it, however I still don't understand it. Please explain what each code is doing.

jQuery(document).ready(function(){ jQuery(".menu-trigger").click(function(){

jQuery("nav").slideToggle(400,function(){ jQuery(this).toggleClass("nav-expanded").css('display',''); }); 

}); });

Epic visual tool

Epson 5030UB 2D/3D 1080p 3LCD Projector Submitted January 30, 2016 at 05:46AM by RawadM http://ift.tt/1Q0ca2H