A fork is a tool for eating. It has points called tines. Most forks have three or four tines. Some cooking-forks have two tines. The tines help you pick up your food. Forks are useful only for eating solid food. For example, a fork would be useless for eating soup because all the soup would fall through the tines and into your lap. Most forks are made of metal. Some are made of plastic or wood.
The word "fork" is also used to describe a two choices of course. A fork in the road would be a split in the road leading in two (or more) directions.