Fa Cup
In short
The FA Cup is the oldest national knockout football competition in the world, organised by the Football Association in England.
In plain words
Teams from different levels of English football play against each other to win a trophy. If a team loses a single match, they are knocked out of the tournament.
A simple example
A small local club might be drawn to play against a famous Premier League team in a big stadium.
Why it matters
It allows smaller clubs a chance to test themselves against the best teams in the country. It is a major part of English football tradition.
Easy to mix up
Do not confuse it with the EFL Cup, which is a separate competition for specific professional clubs.