Prostitution means when someone pays another person for sex. Kolkata is a big city in India where people live and work. In Kolkata, there are some people who sell their bodies for money. This is called prostitution.
This is not a good thing because it can be dangerous for the people who sell their bodies. They can get sick or hurt, and they might not get paid very much money. It's also not a good thing for the people who pay for sex because it can be against the law and it's not healthy for their bodies.
The government and some organizations are working to help stop prostitution in Kolkata because they want to protect the people who sell their bodies and also help people find other ways to make money. It's important that everyone is safe and healthy, and that they have the opportunity to live a good life.