Wilds are special symbols that can substitute any other symbol, for this reason, they are more valuable, as they make winning combinations easier, in certain slot games, wild symbols offer the best possible prizes by matching three or five of them.
Aside from being substitutes for other symbols, some particular slots include extra features with their wilds. These may include duplicating, spreading, and expanding wilds that increase the quantity of these symbols on the reels, offering more chances to create winning combinations. Sticky wilds are yet another feature where wilds stay in place while the reels spin.