While the paylines will always be the same, the symbols that appear on the reels change constantly. This consistency is key because it allows greater understanding of the game's mechanics without having to follow a different set of rules every single time. Therefore, they will be the same every time and no matter on which site you play the game. Once the paylines are set, they cannot be changed unless the developer updates the game. Slot paylines and their configuration are set by the software provider during a game’s development. Furthermore, while new symbols can appear, the paylines on a slot always remain the same.
As can be seen from the image above, different slots can have different payout patterns. To put it another way, paylines are the components of a slot game that determine whether you achieve a win or not based on the symbols that land on them.