Pumpkin varieties
There are many varieties of pumpkins, including:

Jack-o’-lantern: a large variety that’s used for carving
Pie pumpkins: a smaller, sweeter variety
Miniature: used for decoration but also edible
White: used for decoration but can be cooked
Giant: mostly grown for contests; technically edible but less flavorful than smaller pumpkins

Most of the pumpkin that’s sold in the United States is canned.