The term 'Black Fruit' can refer to three different fruits: SLOE, OLIVE, and Olives. SLOE is a small, dark-purple fruit that is related to the plum family and is commonly used to make jams and liqueurs. OLIVE is a small, black fruit that is often used in cooking and is a major component of the Mediterranean diet. Olives are the cured version of the OLIVE fruit, which are usually preserved in brine or oil and are a popular snack food.