Money is used as means of exchange. It was created during Antiquity, and enabled to replace bartering. Having no material value, money, within a state, enables to dictate the value of everything by giving it a monetary statute.

In all countries or states, money is called currency. It simplifies trading and is used to pay for a service or good. Today, everything is exchangeable against money, be it something material, intellectual or spiritual. To a majority of human beings, money is the ultimate goal in their lives: the more they get, the better their lives.

Money is the symbol of a man's evolution within a society: money separates more than it unifies. Some people even kill to get money.

Gambling is not authorized everywhere. Legislation varies depending on the various games. There are two main categories in which they are split: chance and skill games.

Today, legislation forbids games of chance on the Internet (State monopoly). The most popular games of chance are poker, bets, and casino games. There are several illegal websites which do not respect the rules in effect in the different countries by authorizing people who live in those countries (where gambling is forbidden) to play.
Games of skill are completely legal. The difference with games of chance relies in the fact the player's capacity determines the result, not chance. Therefore, you can try one of your favorites games (solitaire, Mahjong, pool/snooker) which are full of adrenalin, competition, and potential real money gains.
There are only a few websites of games of skills where people can get paid, but those which exist are completely legal and respect the rules in effect.
Did you know that the priest of the Anglican Church of Monte-Carlo, back in the 30s, only sang canticles and hymns of praise of which classification numbers were superior to 36? That is because otherwise people used to immediately go out to the Casino and play the canticle number at the roulette (which only has 36 numbers...).