1. INTRODUCTIONThe hockey is a family of sports in which two teams compete to take a hard ball or a rubber disc to the opposing goal to score a goal with the help of a long stick called stick. Although there are several modalities (inline, underwater skates …), I am going to focus, in the present work, on the three most important ones: on the ice, on skates and grass.2. DESCRIPTION, PLAYERS, AND OBJECTIVE.2.1. Ice hockey is a sport that is played between two teams, with skates on an ice rink. The skaters must direct a rubber disc (the puck ) with a long stick ( stick ). The number of players per team is six (five players + goalkeeper), and the goal is to score goals in the opposing goal. 2.2. The hockey on skates or hockey patin is a sport that is disputed between two teams. The players move thanks to four-wheeled (parallel) skates and use a stick or wooden stick with a curved shape to drive a rubber ball. The number of players per team is five (four players + goalkeeper), and the goal is to score goals in the opponent’s goal. 2.3. Field hockey or field hockey is a sport in which two rival teams compete to put a ball into the goalpost of the opposing team (goal) with the help of a stick that allows control of the ball. The number of players per team is eleven (ten players + goalkeeper). The objective is to score more goals than the opposing team at the end of regulation time. 3. HISTORY: ORIGINS, FIRST COMPETITIONS. 3.1. Ice hockey was invented in Canada in the 19th century, thanks to European immigrants who adapted grass hockey and other sports such as hurling or shinty to the climate of the area. The first matches, of real character, were played between British soldiers on surfaces of frozen water, like rivers and lakes. In the beginning, they played with curved sticks and rubber ball. Many claims that it was a game of the Canadian natives, known as tooadijik, the origin of this sport.On March 3, 1875, it was the first time that an indoor match was played in the city of Montreal and 1877 several students from McGill University decided to write the first ice hockey regulation. The first European teams emerged in England from the universities of Oxford and Cambridge. 3.2. Roller hockey is considered to have been invented at the end of the 19th century in England by Edward Crawford, as an adaptation of ice hockey. By the period of the 19th century, its practice had spread throughout most of Europe, and in the first decades of the 20th time, it began to be trained in Latin America.The Cerdanyola HC, from Cerdanyola del Valle (Barcelona), was the first Spanish team to be federated on September 3, 1936, to the Catalan Skating Federation. 3.3. Hockey on grass or grass is an ancient sport that was practiced by people of high social status, although its exact origin is not known. There are drawings of two people using sticks with a ball in Ancient Egypt. Also, there is a relief of the Middle Ages where people can be seen playing with bats and balls. It is also believed that it could have originated in Asia and, from there, British settlers could have adopted it and taken it to Europe. This is how, at the end of the 19th century, the first grass hockey association was created.About us:Olympics, it can be said that this modality is the only one of the three that is not an Olympic sport. However, it was present as an exhibition sport in the 1992 Olympic Games held in Barcelona, the Argentine national team being the champion and the runner-up in Spain.