Wild symbols is a term that refers to a group of special symbols found in video slots and slot machine games.
To win, you have to land a winning combination of three or more symbols on an active payline. Every slot game comes with numerous symbols, making it more difficult to get three or more of each on a payline. However, wild symbols can substitute for every other symbol, apart from bonus symbols such as scatters, allowing you to make winning combinations much easier.
There are several different types of wild symbols, such as stacked wilds, sticky wilds, shifting wilds, and expanding wilds. While each of these wilds works differently, fundamentally, they all serve the same purpose and are there to substitute for other basic symbols.