The answer to 'why is my faucet making gurgling noise' is that the gurgling sound is likely caused by a blockage or obstruction in the plumbing system. This could be due to a clogged drain, a problem with the faucet aerator, or an issue with the sink's P-trap.
Gurgling noises often indicate that air is being forced back up through the faucet, which can happen when there is a blockage preventing proper water flow. This is a common plumbing problem that should be addressed to prevent further issues like leaks or water damage.