There are four grand slam in tennis tournaments. They are: The Australian Open, The French Open, The Championship Wimbledon and The U.S. Open. The first tournament is the Australian open which is usually around January then The French Open around May and June. The third is the Wimbledon in July and The last is the U.S. Open around August and September. The tournaments are operated by the Association of Tennis Professionals (ATP).
The grand slam titles in tennis are:
1) Non calendar year grand slam: winning all the four tournaments but not in the same year.
2) Career grand slam: winning all the four tournaments at any point of a career
3) Golden grand slam: winning gold medal at Olympics and winning all the four tournaments in one year.
4) Super slam: winning year end championship.