Spiders communicate by using different levels of vibrations, also called seismic communication, when courting, warning rivals or attempting to catch prey. Some spiders use only the legs to create the vibrations, while others will use a combination of the legs and the abdomen to communicate seismically.
Male spiders use seismic communication to communicate with female spiders and attempt to reproduce. Those that communicate well are often more successful at obtaining a mate.
Spiders will also use seismic communication to warn a rival spider that it is approaching. The rival will often flee the area upon feeling the vibrations. Some spiders will mimic the vibrations of insects caught in webs to trick and catch prey spiders.