Aphids are small, soft-bodied insects that belong to the family Aphididae. They typically measure about 1 to 10 millimeters in length and come in various colors, including green, black, and yellow. Aphids feed on plant sap by using their specialized mouthparts to pierce plant tissues. This feeding can weaken plants, leading to stunted growth and reduced yields. These insects reproduce quickly, often giving birth to live young rather than laying eggs. Aphids can also produce a sticky substance called honeydew, which can attract other pests and lead to the growth of sooty mold on plants. They are commonly found on a variety of plants, including vegetables and ornamental flowers.