Wilds are icons that can substitute for any other symbol on a pay line in a slot machine. They can increase your chances of winning a game, but they can also cause you to lose.
Most wilds are found in classic slot machines. They include icons such as fruits, bars, and bells.
Some newer machines use special wilds, such as the scatter symbol.
In general, the more wilds you have on the screen at one time, the greater your chances of winning. However, if you have too many wilds, they can also cause you to lose because they can replace any other symbol on the pay line.