In the United States customary system, there are 2,000 pounds in a ton. This unit of weight is commonly known as a "short ton" or "net ton."
In the imperial system (used in some other countries), a ton is equivalent to 2,240 pounds. This unit is often referred to as a "long ton" or "imperial ton."
When someone refers to a "ton" without specifying whether it's a short ton or long ton, it's usually assumed to be a short ton.