Cockroaches are insects of the order Blattodea. The name cockroach comes from the Spanish word cucaracha.

Among the best-known pest species is the German cockroach, Blattella germanica, about 15 millimetres (0.59 in) long. It adapts readily to a variety of environments, but prefers warm and humid conditions found within buildings.

The Cockroach leaves chemical trails in their feces as well as emitting airborne pheromone for swarming and mating. These chemical trails transmit bacteria on surfaces.

Cockroaches are mainly nocturnal and will run away when exposed to light.

General preventive measures against household pests include keeping all food stored away in sealed containers, using garbage cans with a tight lid, frequent cleaning in the kitchen, and regular vacuuming.