Wild Symbols are special icons found in many slot games that can substitute for other symbols to help create winning combinations. They often enhance the gameplay by increasing the chances of landing a payout. In addition to their substitution ability, some Wild Symbols may come with unique features, such as multipliers or expanding effects. This means they can not only replace other symbols but also boost the value of wins or cover more positions on the reel, making them a popular element in online casinos.