Woods has won 14 professional major golf championships, the second highest of any male player (Jack Nicklaus leads with 18), and 71 PGA Tour events, third all time. He has more career major wins and career PGA Tour wins than any other active golfer. He is the youngest player to achieve the career Grand Slam, and the youngest and fastest to win 50 tournaments on tour. Additionally, Woods is only the second golfer, after Jack Nicklaus, to have achieved a career Grand Slam three times. Woods has won 16 World Golf Championships, and has won at least one of those events each of the 11 years they have been in existence.

Woods has held the number one position in the world rankings for the most consecutive weeks and for the greatest total number of weeks. He has been awarded PGA Player of the Year a record ten times, the Byron Nelson Award for lowest adjusted scoring average a record eight times, and has the record of leading the money list in nine different seasons.

On December 11, 2009, Woods announced he would take an indefinite leave from professional golf to focus on his marriage after he admitted infidelity. His multiple infidelities were revealed by over a dozen women, through many worldwide media sources. Woods returned to competition for the 2010 Masters on April 8, 2010, after a break lasting 20 weeks.

In July 2010, Forbes announced Tiger Woods as the richest sportsman in the world earning a reported $105m according to them and $90.5m according to Sports Illustrated.

Woods was born in Cypress, California, to Earl (1932–2006) and Kultida (Tida) Woods (born 1944). He is the only child of their marriage but has two half-brothers, Earl Jr. (born 1955) and Kevin (born 1957), and one half-sister, Royce (born 1958) from the 18-year marriage of Earl Woods and his first wife, Barbara Woods Gray. Earl, a retired United States Army lieutenant colonel and Vietnam War veteran, was of mixed African American, Chinese, and Native American ancestry. Kultida (née Punsawad), originally from Thailand, is of mixed Thai, Chinese, and Dutch ancestry. This makes Woods himself half Asian (one-quarter Chinese and one-quarter Thai), one-quarter African American, one-eighth Native American, and one-eighth Dutch. He refers to his ethnic make-up as “Cablinasian” (a syllabic abbreviation he coined from Caucasian, Black, (American) Indian, and Asian).

From childhood he was raised as a Buddhist and actively practised this faith from childhood until well into his adult career. He has attributed his deviations and infidelity to his losing track of Buddhism. He said that "Buddhism teaches me to stop following every impulse and to learn restraint. Obviously I lost track of what I was taught."

At birth, Woods was given 'Eldrick' and 'Tont' as first and middle names. His middle name, Tont (Thai: ต้น), is a traditional Thai name. He got his nickname from a Vietnamese soldier friend of his father, Vuong Dang Phong, to whom his father had also given the Tiger nickname. He became generally known by that name and by the time he had achieved national prominence in junior and amateur golf, he was simply known as 'Tiger' Woods.

Woods grew up in Orange County, California. He was a child prodigy, introduced to golf before the age of two, by his athletic father Earl, who was a good standard amateur golfer and one of the earliest Negro college baseball players at Kansas State University. In 1978, Tiger putted against comedian Bob Hope in a television appearance on The Mike Douglas Show. Before turning three, Tiger entered and won the Under Age 10 section of the Drive, Pitch, and Putt competition, held at the Navy Golf Course in Cypress, California. At age three, he shot a 48 over nine holes over the Cypress Navy course, and at age five, he appeared in Golf Digest and on ABC's That's Incredible. In 1984 at the age of eight, he won the 9–10 boys' event, the youngest age group available, at the Junior World Golf Championships. He first broke 80 at age eight. He went on to win the Junior World Championships six times, including four consecutive wins from 1988 to 1991.

Woods' father Earl wrote that Tiger first beat him when he was 11 years old, with Earl trying his best. Earl lost to Tiger every time from then on. Woods's first major national junior tournament was the 1989 Big I, when he was 13 years old. Woods was paired with pro John Daly, then relatively unknown, in the final round; the event's format placed a professional with each group of juniors who had qualified. Daly birdied three of the last four holes to beat Woods by only one stroke. As a young teenager, Woods first met Jack Nicklaus in Los Angeles at the Bel-Air Country Club, when Nicklaus was performing a clinic for the club's members. Woods was part of the show, and impressed Nicklaus and the crowd with his skills and potential.

While attending Western High School in Anaheim at the age of 15, Woods became the youngest ever U.S. Junior Amateur Champion in 1991, was voted Southern California Amateur Player of the Year for the second consecutive year, and Golf Digest Junior Amateur Player of the Year for 1991. In 1992, he defended his title at the U.S. Junior Amateur Championship, becoming the first multiple winner, competed in his first PGA Tour event, the Nissan Los Angeles Open, and was named Golf Digest Amateur Player of the Year, Golf World Player of the Year, and Golfweek National Amateur of the Year.