A payline in online slots is a line that extends from one side of a slot window to the other. Once the wheels stop spinning, you will see icons under the payline that are supposed to match in a certain way. Modern slot machines don’t come with one center payline running across the window. Instead, the payline can feature numerous distinct geometric shapes, which could be zigzagging across the screen through the three icons. To increase your chances of winning, you should wager on multiple paylines.