Nerf is a toy brand formed by Parker Brothers and currently owned by Hasbro. Most of the toys are a variety of foam-based weaponry, with other Nerf products including balls for sports such as American football, basketball, and baseball. Their best known toys are their dart guns that shoot ammunition made from "Nerf foam". Their primary slogan, introduced in the 1990s, is "It's Nerf or Nothin'!". Annual revenues under the Nerf brand are approximately US$400 million.

Parker Brothers was an American toy and game manufacturer which in 1991 became a brand of Hasbro. More than 1,800 games were published under the Parker Brothers name since 1883. Among its products were Monopoly, Clue, Sorry!, Risk, Trivial Pursuit, Ouija, Aggravation, Bop It, Scrabble, and Probe. The trade name became defunct with former products being marketed under the "Hasbro Gaming" label with the logo shown on Monopoly games.