Slot machines are popular both in live casinos and online casinos. Some terms and explanations are here:

Bonus rounds (bonus round)
Some combinations can trigger a bonus round. It is often played on a different screen and the wheels are not turned, instead you play a sort of mini-game. You can win a hidden price and you are always guaranteed a minimum amount and then depending on how you do on one bonus round you can get extra money.

Payline (pay line)
A payline is a winning combination on an active line. The more lines you bet on the greater the chances of winning. You can choose different numbers depending on the slot machine you play on. Sometimes there may be up to 30 lines.

Coins (coins)
You decide how much you want to bet per line. You can increase or decrease the coin value between the different games.

Credit
This is the balance you can play for.

Paytable (gain table)
On this table you can see what combinations are winning combinations and how much the profit is.

Progressive jackpot
A progressive jackpot is a jackpot that grows as long as no one wins it. Usually several machines are linked together by various casinos and that can create a really huge jackpot. You have to play with maximum bet to win the jackpot.