15 points is the minimum points
It means if you win that point you win the match.
Match point is played just like any other point in tennis, where the server must serve into the opposite service box on the receiver's side, but if the person with the match point wins the point, the match is over.
Best 4 out of 7, games to 11 with a minimum of 2 point margin to win.
"Game, set, and match" is the term for the final point scored in a tennis match. It's effectively a shorthand for saying "that point ends the game, that game ends the set, and that set ends the match."
After every point.
after every point
match, point, serve, ad out
A match point is a point that, if won by the person who has the match point, would result in winning the match, thus the "match point." If someone has a match point, they are one point away from winning a match. In a scenario where the person who has match point is up 40-0, then the person will have 3 match points (if the opponent wins two points, the person will still have an opportunity to win).
It's a tennis match, and a track meet.