Snickers is a brand name chocolate bar made by Mars, Incorporated. It consists of peanut nougat topped with roasted peanuts and caramel, enrobed in milk chocolate. Snickers has an annual global sales of $2 billion.
In the United Kingdom and Ireland, Snickers was formerly sold under the brand name Marathon until 1990. More recently, Snickers Marathon branded energy bars have been sold in some markets.
Info gleaned from Wikipedia