The aerator is a tiny fitting located at the tip of the gold and black kitchen faucet. It's responsible for mixing water with air and preventing it from shooting out. It contains small holes for air to enter and out. This fitting also has vents that collect mineral deposits and sediments. If you can remove these parts, you can improve the functionality of your faucet. But remember to be careful not to bend the metal part, as it can break and cause more problems.