Pholcidae, commonly known as cellar spiders, are a family of spiders characterized by their long legs and small bodies. They are often found in dark, damp places like basements, caves, and corners of rooms. These spiders are known for their delicate webs, which they use to catch small insects. Cellar spiders are generally harmless to humans and are beneficial for controlling pest populations. They have a unique behavior of shaking their webs when threatened, which can confuse predators. With over 1,500 species worldwide, Pholcidae play an important role in the ecosystem as both predators and prey.