Cicada is an insect belonging to the order Hemiptera, and is commonly known for its loud chirping sound. It is related to other insects such as locusts, grasshoppers, and isyearlocusts. The term cicada is derived from the Latin word cicada, which means 'tree cricket'. Locusts are a type of GRASSHOPPER that can form large swarms and cause extensive damage to crops. Chirr is the sound made by cicadas, and isyearlocusts are a type of cicada that has a one-year life cycle. Grasshoppers are also related to cicadas, and are typically larger than cicadas.