Parasteatoda tepidariorum, commonly known as the common house spider, is a species of cobweb spider found in many parts of the world. It typically builds irregular webs in corners of rooms, attics, and basements. These spiders are small, usually measuring about 5 to 10 millimeters in body length, and are often brown or gray in color. This species is non-aggressive and poses little threat to humans, as their bites are rarely harmful. Parasteatoda tepidariorum primarily feeds on small insects, helping to control pest populations in homes. They are known for their ability to adapt to various environments, making them common household inhabitants.