Champion
In short
A champion is the person or team that wins a specific competition, contest, or challenge.
In plain words
When you compete against others and come out on top, you are the champion. This title can apply to many levels, from a small local club to a global tournament.
A simple example
A tennis player who wins the final match of Wimbledon becomes the Wimbledon champion. They hold the title until the next year's tournament is finished.
Why it matters
Winning a championship proves that a person or team is the best in their field. It often brings prestige, trophies, and special rewards.
Easy to mix up
Do not confuse a champion with a contender, who is someone trying to win but has not yet succeeded.