Wild symbols have become an integral part of today’s online video slots, and they’ve come a long way from the original symbols found on the early one-armed bandits.
Wilds act in much the same way as the joker in a game of cards, which substitutes itself for any other card to make a winning hand. In the case of slots, these symbols substitute for all other symbols to make a winning combination.
There are some symbols that they cannot substitute for, including scatters and bonus or free spins icons on some games, but they can generate big wins and game developers have come up with plenty of innovative ways of using them.