How do i unclog the sink drain?

first off never use drano,or kaboom or any store bought "remedy". Its terrible for your pipes,and for and equipment a plumber may ever use,and it will cost you big time.It doesnt even work,its just a gravity fed acid that "might make a small hole on the bottom of the build up if your lucky.Its probably just hair stuck on the pop-up assembly. Look under your sink at the drain assembly. you will see a rod sticking out of it. It is held on the drain assembly by a round nut. unsrew that nut and you can pull the rod off and pull the pop up right out of the drain.then you can dig out hair from there.If that doesnt work you could try using a plunger from the top,and make sure to cover any overflow on your sink with a wet rag.(to create a vacumm) If that doesnt work dissasemble p-trap ,and the trap arm going into the wall. it should be held on by a nut(newer ones are anyways).run your snake from there ,not from the top, you will bust your p-trap from the top.