A stock or a cage is like a big box made of metal bars that is used to hold things, usually living things like animals. It's like a house, but instead of walls, it has bars that let you see inside. Where you might have a bed or a couch in a house, a stock or a cage might have food and water bowls or toys for the animal inside. Stocks or cages are often used to help keep animals safe and secure while people are taking care of them. They can be found at places like pet stores, zoos, and even in some people's homes if they have pet animals that need to be kept safe.