In the game Roulette you have a wheel that features red and black slots that have the numbers from 1 to 36 on them and one or two green zero slots – depending on if you’re playing European or American roulette. You have a table which also features the numbers and several additional sectors on which you can place bets.
After all the participants in the game have placed their bets on the table, the dealer spins the wheel and throws in a ball. Whichever is the number of the slot the ball lands in is the winning number. If you have bet on that number or on a group of numbers that contain it then you win a certain amount. In roulette, you can bet on a single number or on different groups of numbers. There are many betting combinations all of which bring you different odds for winning and different payouts.
All roulette bets are divided in three main categories: inside, outside and announced bets.

Inside bets
There are seven types of inside roulette bets:

Type of bet Explanation
Straight This is a bet that covers only one number. In order to make this bet, place the chip inside the square of the number.
Split A bet on two numbers which are adjacent on the table, made by placing the chip on the shared line of the two numbers’ squares.
Street Street A bet on three consecutive numbers located on the same line. Make the bet by placing the chip on the outer corner of the row.
Six Line Six Line A bet on two adjacent lines. In order to make this bet, you have to place the chip on the common outer corner of the two lines.
Corner Corner This is a four-number bet, placed by putting the chip on the common corner of the four numbers. Also called ‘square’ bet.
Trio A three-number bet that includes the zero or zeros. Place the chip on the line shared by the zero box and the two other numbers.
Basket Bet on 0, 1, 2 and 3 with a chip on the corner shared by the zero box and the first line. In American Roulette, it includes the double zero.
Outside bets
Outside bets are those that are placed outside the number field on the sectors that cover the bigger groups of numbers. There are five common types outside bets:

Type of bet Explanation
Red/black Bet on the colour of the winning number.
Odd/even Bet on whether the winning number will be odd or even.
1-18 or 19-36 Bet on whether the winning number will be low (18 or lower) or high (19 or higher).
Dozens Bet on one of the three dozen that are found on the layout of the table.
Columns Bet from which of the three columns will the winning number be.
Before the deal begins, players has to place a bet. The bet must place in front of the player, in a designated area. Minimum and maximum limits are established on the betting, which can be different per casino or site.

Type of bet Payout
Straight 35 to 1
Split 17 to 1
Street 11 to 1
Six Line 5 to 1
Corner 8 to 1
Trio 11 to 1
Basket 6 or 8 to 1 (based on country)
Red/black 1 to 1
Odd/even 1 to 1
1-18 or 19-36 1 to 1
Dozens 2 to 1
Columns 2 to 1