Popcorn is a snack food made by heating certain kinds of corn. There is a small amount of water inside the seeds, which causes them to explode. When the seed shell breaks a sharp noise is made. The name "pop" is because of this noise. After it pops it is white and fluffy.
Salt and melted butter is often added to popcorn. Sometimes caramel and other flavours are melted and mixed into the popcorn.
Popcorn is a popular food to eat at the cinema.