The answer to 'why is my sink leaking water' is that there are several common causes, including worn washers, loose connections, cracked pipes, or a faulty sink drain. Symptoms of a leaking sink can include dripping water, wet cabinets or floors, and reduced water pressure. Solutions may involve tightening connections, replacing washers or seals, or addressing more serious issues like cracked pipes.
If the leak is minor and you feel comfortable doing basic plumbing work, you may be able to fix it yourself. However, for more complex issues or if you're not experienced with plumbing, it's best to call in a professional plumber. They can diagnose the problem and make the necessary repairs to stop the leak and prevent further water damage.