In tennis, doubles team or a singles player is said to have won the Grand Slam if they managed to win all four championships given below during the same year:
- French Open
- Australian Open
- US Open
- Wimbledon

Therefore, these tournaments are known as the Grand Slam tournaments. They bear a status of the most prestigious tennis competitions of the year in the people's mind, as well as in terms of prize-money awarded and world ranking points. The titles are commonly known as Grand Slam titles.

It's an interesting fact that the term Grand Slam was used in 1933 at first time, by the journalist John Kieran from the United States. Kieran used it in describing the attempt by Jack Crawford to succeed in winning all four major titles. Kieran selected these four titles as the major in tennis because they were the most important international tournaments held in merely four countries who had been the victors of the Davis Cup. That year, Crawford failed to attain the Grand Slam because he lost the final match in the US Championships to Fred Perry. The first person succeeded to achieve the Grand Slam was Donald Budge who made it in 1938 and became the first player to join the community of Grand Slam winners

The complete list of true Grand Slam winners in the chronological order:
Singles:
1938 -- Don Budge
1953 -- Maureen Connolly
1962 -- Rod Laver
1970 -- Margaret Smith Court
1988 -- Steffi Graf

Doubles:
1951 -- Ken McGregor and Frank Sedgman
1963 -- Ken Fletcher and Margaret Smith
1984 -- Pam Shriver and Martina Navratilova
The only junior singles player who won the Grand Slam's all four tournaments within one calendar year was Stefan Edberg who made it in 1983.

Although the term Grand Slam was originally applied to the winning of all four major titles within the same calendar year, today it is sometimes applied to holding all four titles at the same time, not considering the calendar. Holders of all four Grand Slam championship titles consecutively, but not within the same calendar year:
Singles:
1983-1984 -- Martina Navratilova (six tournaments in a row)
1993-1994 -- Steffi Graf
2002-2003 -- Serena Williams

Doubles:

1992-1993 -- Natasha Zvereva and Gigi Fernandez (six uninterrupted titles)

The term Career Grand Slam is used for winning all four Grand Slam championship titles non-consecutively. List of the players who won all for major titles but not consequently and received the titles of career Grand Slam winners:
1933-34-35 -- Fred Perry
1949-50-51-54 -- Doris Hart
1951-56-57 -- Shirley Fry
1961-63-64 -- Roy Emerson
1966-67-68-72 -- Billie Jean King
1974-75-82 -- Chris Evert
1992-94-95-99 -- Andre Agassi

A number of great players of different tennis eras, especially in the men's tennis, have failed to attain the Career Grand Slam and become one the carreer Grand Slam winners due to their incapability of winning a particular title. John Newcombe, Boris Becker, Jimmy Connors, Pete Sampras, and Stefan Edberg all failed to come first the French Open, whereas Ivan Lendl, Ken Rosewall, and Mats Wilander all failed to succeed in Wimbledon.

The Golden Grand Slam is applied to winning all four Grand Slam titles and the Summer Olympics Gold medal in the same calendar year.