This tournament type is notable for its participation by professional and amateur teams from many levels of a country's league system.
The structure of the competition varies but is usually a knockout format and is typically organized by the country's governing body for the sport (football association).
The tournament is typically a knockout format where matchups can be played as a single match or a two-legged tie.
[4] Lower ranked teams would enter in earlier rounds or in a qualifier for the main tournament.
[5] A giant-killing, also known as an upset, is when lower-league sides slay the 'giant' of a team objectively viewed as the odds-on favorite to win the tie, or the whole tournament.