The four majors (for men's Golf) are:
The Masters, which is run by Augusta National Golf Club, and played in April
The US Open, which is run by the USGA and is played in June
The Open Championship (often called the British Open in the US), which is run by the R&A and played in July, and
The PGA, which is run by the PGA and played in August.
Note that the PGA is the old PGA, the one that is now basically the association of club pros and teachers, not the PGA Tour, which is the touring professional players.
There's no authoritative committee that decides what's a major. These are the championships that have established a sufficient reputation to stand out from the rest. Things that go into major status are strength of field, prize money, qualification for subsequent events, and public recognition. Players don't stay home from majors unless they have to. Nobody misses the British Open to rest up for the Quad Cities, er, JOHN DEERe.
The PGA Tour would very much like to run its own major championship, and often hints that the Player's Championship (now in May) should be considered a major. If it were, there would be a major-a-month from April to August, which is probably too many.
All golf majors are played in 18 hole rounds.
USA
A WGC event is a World Golf Championship event, these are the most prestigious golf events after the majors.
Jack Nicklaus with 18.
who won 18 majors in Golf
It is the first of four men's professional golf majors held every year. It is played Augusta National, Augusta, Georgia.
1986
Sam Snead with 82.
Jack Nicklaus is a golf legend. He currently holds the record for most golf majors won at 18. Tiger Woods has focused on breaking Jack Nicklaus' record in majors and has won 14 majors thus far. Jack Nicklaus is well known also off golf course in golf course design, philanthropy, and the dedication to promoting the game of golf. He recently lobbied successfully to get golf into the Olympics and is widely viewed as the model for sportsmanship.
He's won lots of Majors and even more other tournaments.
The PGA Championship is the fourth of four majors in men's professional Golf.
3 open championships and three masters for 6 total