Many different kinds of spiders live in and around dwellings. Some, such as the cellar spider, construct webs to help entrap their prey. Others, like the wolf spider, are free roaming and make no webs. The majority of spiders have fangs too small or weak to puncture human skin. Those that are capable of biting humans generally will not do so, unless they themselves are harmed or threatened.
Nonetheless, many people are unwilling to share their home with spiders — harmful or not. Their webs, fecal spotting, and discarded prey can also become an unsightly nuisance.