Straight Up Bet - A bet on an individual number. The simplest roulette bet with the highest pay-out chance. This bet pays at 35 to 1 plus the original stake.
Split Bet - A two number bet which is placed on the line connecting the two numbers. For example covering 24 and 27. This type of bet pays 17 to 1 plus the original stake.
Corner Bet - A four number bet, placed at the corner of 4 numbers. For example covering 8, 9, 11 and 12. This bet pays 8 to 1 plus the original stake.
Street Bet - A three number bet, placed at the end of a row of numbers. For example covering 13, 14 and 15. A street bet pays 11 to 1 plus the original stake.
Line Bet - A six number bet placed at the junction of two street bets. Covering for example 31, 32, 33, 34, 35 and 36. Line bets pay 5 to 1 plus the original stake.
Special Bets - These are a number of multiple bets that are traditional to the game. Each bet covers a different group of numbers. These bets are available through the special bets button. Pay-outs vary for these bets.
You can view a full guide on how to play Roulette here