Aphididae, commonly known as aphids, are small insects belonging to the family Aphididae. They are typically found in large numbers on plants, feeding on sap using their piercing-sucking mouthparts. Aphids are known for their ability to reproduce rapidly, with females giving birth to live young without the need for mating. They can cause damage to plants by stunting growth, transmitting plant diseases, and producing honeydew, which attracts ants and promotes the growth of sooty mold.