Which sport is associated with the term "Grand Slam"?

In tennis, the term "Grand Slam" refers to the prestigious achievement where a player wins all four major championships in a single calendar year: the Australian Open, French Open, Wimbledon, and US Open. These tournaments are noted not only for their historical significance but also for being held on various court surfaces, which tests the versatility and skill of the players. Achieving a Grand Slam is one of the highest accomplishments in tennis, underscoring a player's dominance across different playing conditions.