Venom is a fictional character in the Marvel Comics universe. It is one of Spider-Man's archenemies. Use with the [marvel] tag. Use only for questions about Venom, and not merely places where it appears.
Venom is an antagonistic, sentient extra-terrestrial being known as a Symbiote and is one of Spider-Mans archenemies (not to be confused with the red-tinged Carnage, another Symbiote). The creature consists of a black shape shifting goo that requires a biological host in order to survive, and imbues that being with enhanced powers. Spider-Man briefly hosted the form-fitting alien and incurred its unending wrath when he rejected the bond.
The symbiote has been worn by several hosts since leaving Spider-man. The most significant are Eddie Brock, Mac Gargan, and Flash Thompson. Eddie was the first person to bond with the symbiote after Peter and is the most widely known version of Venom. Mac was the supervillain Scorpion before he acquired the symbiote and became Venom for a time. Flash used the symbiote as a superpowered suit while working for the government before striking off on his own to be a superhero.