First of all, the bonuses and points of the four Grand Slams are very rich. Singles and doubles champions can get 2000 points and about $3 million in prize money. In other competitions, the score is generally 250,500,900, 1000, the best score is 1500, and the prize is about 2.5 million dollars.
Secondly, the singles in the four Grand Slams are 128, while those in other competitions are generally 32, and those in the higher level are 64.
Then, because there are many tickets, the schedule is usually about two weeks. Both men's and women's singles competitions adopt the long-set tiebreaker system, while men's singles competitions have the best five sets, which is impossible in other competitions.
At the same time, only four Grand Slams have set up mixed doubles, and there are no mixed doubles in other tennis matches.
Finally, "Grand Slam" is a term borrowed from bridge competition, which means to win all the piers of 13, including all the meanings. In tennis, it means that a tennis player won the four major tennis championships of the US Open, French Open, Australian Open and Wimbledon in the same year.