A black widow is a type of spider found throughout North America, famous for the shiny black color of the female and the red hourglass marking on her underside. These spiders are venomous, and their bite can make a person very sick, though deaths are extremely rare because antivenom exists and most healthy people recover.

The spider gets its dramatic name because female black widows sometimes eat the male spider after mating, though this doesn't happen as often in nature as people once thought. The female is much larger than the male and builds strong, messy-looking webs, usually in dark, quiet places like woodpiles, garages, or underneath outdoor furniture.

Black widows are shy creatures that prefer to hide rather than attack. They only bite when they feel trapped or threatened, so people who get bitten usually disturbed the spider accidentally. Despite their fearsome reputation, black widows play an important role in controlling insect populations.

The term black widow is also used metaphorically to describe a woman who harms or betrays people close to her, particularly in mystery novels or true crime stories. This usage borrows the spider's dark reputation, though it's worth noting that actual black widow spiders are simply following their natural instincts, not plotting against anyone.