The final (Latin: finis = end) is the last of a series of matches. That can be sports matches, but that's not necessary. It is a condition that there are more than two participants at the start (otherwise there would be only one match and there is no series).
The full range of matches is also called a championship or a tournament. Each match is held between two participants and a knock-out system determines which of the participants may go to the next round. The final game is called the final, the winner of the final is the final winner of the tournament and may call himself a champion.
The matches before the final are named according to the number of matches at that level and not the number of remaining participants; This is what the two games are called for the finals, the semi-finals, the four games before the quarterfinals and the quarter finals matches are sometimes called the eighth finals.
See below schedule, in the quarterfinals, yellow wins from red and blue wins green, so yellow and blue (the winners of the relevant quarterfinals) compete in the semifinals. Schematic representation of a knockout system with eight participants
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