A bedbug is a nocturnal insect with a flat, oval-shaped body and a reddish-brown color, known for its ability to hide in cracks and crevices. It feeds on the blood of its hosts during the night, leaving behind itchy bites that can cause discomfort and irritation. Bedbugs are resilient pests that can infest homes, hotels, and other environments, requiring thorough extermination measures to eliminate their presence.