The answer to this question is yes - a plunger can unclog a sink. When using a plunger, you should insert the cup-shaped end into the drain and then plunge up and down rapidly. This will create suction and help to dislodge whatever is clogging the sink. If the clog is particularly stubborn, you may need to use a little elbow grease and continue plunging until it's gone.It's important to note that not all plungers are created equal. For best results, use a rubber plunger with an attached flange. This type of plunger creates a tight seal around the drain, which helps to create more suction.If you don't have a plunger on hand, there are other home remedies that can be used to unclog a sink. One popular method is to pour a pot of boiling water down the drain. The hot water will help to loosen the clog and allow it to wash down the drain. You can also try using a mixture of vinegar and baking soda. This combination will fizz and eat away at whatever is clogging the sink.If these methods don't work, it may be time to call in a professional plumber. A plumber will have special tools and know-how to quickly unclog your sink without damaging your pipes.