trailer

A trailer is a big car that carries things behind it. For example, when people go on a trip and want to bring their bikes, they can put the bikes on a trailer and the trailer will carry them.

A trailer is also a short video that shows some parts of a movie or a TV show. It helps people decide if they want to watch the whole thing. For example, when you see a short video that shows some funny parts of a cartoon, that's a trailer.