Like all online casino games, video slots have had to evolve or fade away. One area where slots developers are always coming up with new ideas and features, is wild symbols. Over the last few years, we’ve seen so many new types of wild icons appear, that it can be rather confusing as a new player to understand them all. We know that wilds replace themselves with a symbol that a player needs to win, but what else can they do? Let’s take a quick look at some of the more popular types of wild icons to grace our favourite online slots over the last few years, and learn what each of them does.