Slot machines are among the most popular games in online casinos throughout the world. Every year, thousands of players worldwide join and over 70% of profit online casinos earn is precisely from the video slots. History of slot machines is long enough. The very first ancestor of modern video slot was invented in 1891 in Brooklyn, New York. Slots were created on the basis of poker, and contain 50 cards glued on the 5 reels shirts down. layers for the rates used coin and pull the lever, resulting in the rotation of the reels. But since then there was the notion of the payments system, the winner was offered a zero cost drink or possibly a cigar, or another thing. This depended on the institution, previous that was installed a slot machine.