Butter is commonly sold in sticks (pictured) or small blocks, and often served using a butter knife
A spread is a food that is literally spread, generally with a knife, onto bread, crackers, or other food products. Spreads are added to food to provide flavor and texture, and are an integral part of the dish, i.e. they should be distinguished from condiments, which are optional additions. Spreads should also be distinguished from dips, which generally are not applied to food via a knife or similar utensil, such as salsa.