These colourful wild symbols are the equivalent of the joker in a deck of cards which means they can be used to replace other symbols to create a winning combination. For example if you have a 10 (symbol) on reels 1 and 2, and a wild on reel 3, you have successfully created a winning combination.
Wild symbols have the power to substitute for all other symbols on the reels to complete winning paylines. The only exception is that wilds cannot substitute for scatters, free spins or other bonus symbols.
There is no way of knowing when or where the wild symbols will shower up as they tend to pop up randomly on the reels. In some special online slots, they only appear on certain reels. You need to check the casino game’s paytable to learn on where the wilds would appear.
Casino games can also feature a number of special wilds, each bringing its particularly special zest to the game.
Expanding wilds can grow to fill up an entire reel, making it from top to bottom wild. Sticky wilds on the other hand can stay in place over multiple spins to increase your chances of completing paylines. There are also Stacked Wilds which appear on top of the other on a single reel to fill up the entire reel.
Whether a normal wild or a stacked or sticky, wilds bring you the possibility to gain you more wins wherever they appear.