The number of win-lines available in a game is one of the most important features on slots.
A win-line or pay-line, in simple terms, is the line on which a payout will be awarded based on winning combinations.
Early slots (fruitmachines) only had one win-line in the middle.
Nowadays there are a lot of win-lines in any given slot, whether that number be 1 or 80. It is only on these win-lines that winning payouts can be earned for winning combinations.
It is important to understand that you will only win payouts on lines that you bet on. If you only bet on 10 of 20 win-lines and the winning combination falls on a line that you didn’t in bet on, you get nothing for that combination. It’s best to activate all win-lines on every spin. If you don’t you can miss big wins or even jackpot winnings.