How To Remove P-Trap
So if your sink is clogged it could be just something jamming up the P-trap under your sink. The P-Trap is inline with the sink drain and when it gets clogged water will not go through it causing the sink water to back up.
Why Does My Sink Have A P-Trap?
The bathroom sink, kitchen sink and even your washing  has a p-trap for two main reasons that you may not know.
The first reason is to prevent the sewer gases from coming back up into the sink and coming into your home which will cause a realy bad smell.
The second reason is to prevent rats from coming up through the sewers into your home. This widly was a problem in NYC years ago.
Tools you Will Need To Remove The P-Trap
You will need some basic hand tools to remove the P-Trap under your sink.
Most of the time you will be able to loose the nuts on the P-Trap with your hands but sometimes you will need channel locks, or a strap wranch if yoiu have one.