An "aphid" is a small sap-sucking insect that belongs to the family Aphididae. These insects are often found on the foliage of plants and are known for their ability to reproduce quickly. They can be green, black, or brown and are usually very small, often measuring less than a quarter of an inch in length. Aphids are considered pests because they can cause significant harm to plants by extracting their nutrients, leading to wilting and reduced growth.
The word "aphid" comes from the Greek word "aphis," meaning "a little plant bug."