A bag is a special thing that can hold other things, kind of like a container. It's like when you put your toys in a box or a basket, but a bag is usually made out of a soft and flexible material like cloth or plastic. You can use a big bag to carry your clothes when you go on a trip, a small bag to hold your snacks when you go to school, or a fancy bag to take to a party. Bags come in all different shapes, sizes, colors, and styles, and they are very helpful to have when you need to bring some stuff with you somewhere.