Every plumbing fixture in your home should have a P-trap.
Some are located behind the wall or internally on a toilet, but for sinks they are accessible below.
Look for a u-shaped pipe extending down from your sink and back up into the wallthat’s your P-trap.
They also make convenient places for rings and other valuables to settle before being lost forever down a drain.
These traps are prone to clogging, but they are easy to clear.
Place the bucket underneath the trap and carefully loosen the nuts at each end of the p-trap.
Then remove the trap by sliding it down and empty it’s contents into the bucket.
Check for any blockages and clear those.
Don’t overtighten the nuts when you reinstall the P-trap, as they can strip easily.
How to Clean a P-Trap| essortment (YouTube)