Kitchen drains can become clogged over time with food and soap scum. If you notice that the water is not draining or is draining slowly, there are more options open to you than Drano.
Seal up any overflow drains and other openings to the sink. Seal a plunger over the mouth of the drain and plunge the drain several times in quick succession. The suction dislodges the clog so that the water can flow and wash it away.
Unbend a coat hanger, leaving a hook at the end, and use it to snag the clog. A more sophisticated way to manually remove the clog is to purchase an auger, also known as a plumbing snake, and thread it down the drain. An auger has a screw tip that will drag the clog back up or cut it so that it can be washed away.
Do not use Drano or any other drain cleaner on a clogged sink, especially if you live in an older house or apartment. The strong acids in drain cleaners eat away at the clog, but they also corrode the pipes.