A welcome bonus casino is a promotional offer extended to new players upon signing up. These bonuses often come in the form of free spins or bonus money to use on games. By claiming a welcome bonus, players can increase their chances of winning without risking their own money. It’s important to read and understand the terms and conditions attached to welcome bonuses. Some casinos may have wagering requirements or restrictions on certain games. Overall, a welcome bonus casino can provide a great incentive for players to try out new online casinos.