PokerStars is the largest online poker cardroom in the world; it can be accessed through downloadable poker clients for the Windows, macOS, Android and iOS.

Horse racing is an equestrian performance sport, typically involving two or more horses ridden by jockeys or driven over a set distance for competition.

It is one of the most ancient of all sports and its basic premise – to identify which of two or more horses is the fastest over a set course or distance – has remained unchanged since the earliest times.

Sports betting is the activity of predicting sports results and placing a wager on the outcome.

The frequency of sports bet upon varies by culture, with the vast majority of bets being placed on association football, American football, basketball, baseball, hockey, mixed martial arts, track cycling, and boxing at both the amateur and professional levels.

Sports betting can also extend to non-athletic events, such as reality show contests and political elections, and non-human contests such as horse racing, greyhound racing and illegal, underground dog fighting.

Tennis is a racket sport that can be played individually against a single opponent (singles) or between two teams of two players each (doubles).

Each player uses a tennis racket that is strung with cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court.

The object of the game is to play the ball in such a way that the opponent is not able to play a valid return.

The player who is unable to return the ball will not gain a point, while the opposite player will.

American football, referred to as football in the United States and Canada, and also known as "gridiron football" or simply "gridiron", is a sport played by two teams of eleven players on a rectangular field with goalposts at each end.

The offense, the team with control of the oval-shaped football, attempts to advance down the field by running with or passing the ball, while the team without control of the ball, the defense, aims to stop their advance and take control of the ball for themselves.

The offense must advance at least ten yards in four downs, or plays, or else they turn over the football to the opposing team; if they succeed, they are given a new set of four downs.

Points are primarily scored by advancing the ball into the opposing team's end zone for a touchdown or kicking the ball through the opponent's goalposts for a field goal.

The team with the most points at the end of a game wins.