Slots are machines that allow players to insert money into a designated slot, and then play the machine for credits based on the paytable. The player wins credits if the symbols on the reels match those in the pay table.
The pay table lists the number of coins that will be paid for each winning combination, including combinations of wild symbols. The pay table also lists a maximum bet that can be placed on each line.
Multi-line slots, meanwhile, have many more lines than a single payline; for example, a player may bet on up to 200 lines at a time. They are called multi-line because they have a higher chance of triggering a payout than a single payline.
Progressive jackpots are the biggest prize on a slot machine. These jackpots grow over time until they are won by someone.
Bonus modes, meanwhile, add features to the game. These can include a second screen, free spins, or a mystery pick game. They can also add a random win multiplier sequence.
Some modern slot machines have microprocessors that assign a different probability to every symbol on the reel. This allows manufacturers to essentially give different odds to certain symbols, making them look like they have more winning chances than other symbols.