The "Six Nations" tournament is significant in the sport of rugby as it features six European nations: England, France, Ireland, Italy, Scotland, and Wales. It consists of annual competitions in which these teams compete for the championship title. The tournament celebrates rugby heritage and fosters intense rivalries among the nations. Each team plays against every other team, and the tournament typically occurs during the spring. The Six Nations is an essential part of the rugby calendar, showcasing thrilling matches and driving national pride.