Jeopardy! is an American television game show created by Merv Griffin. The show is a quiz competition that reverses the traditional question-and-answer format of many quiz shows. Rather than being given questions, contestants are instead given general knowledge clues in the form of answers and they must identify the person, place, thing, or idea that the clue describes, phrasing each response in the form of a question.

The original daytime version debuted on NBC on March 30, 1964, and aired until January 3, 1975. A nighttime syndicated edition aired weekly from September 1974 to September 1975, and a revival, The All-New Jeopardy!, ran on NBC from October 1978 to March 1979 on weekdays. The syndicated show familiar to modern viewers and aired daily (currently by Sony Pictures Television) premiered on September 10, 1984.

Art Fleming served as host for all versions of the show between 1964 and 1979. Don Pardo served as announcer until 1975, and John Harlan announced for the 1978–1979 season. The daily syndicated version premiered in 1984 with Alex Trebek as host and Johnny Gilbert as announcer. Trebek hosted until his death in November 2020, with his last episode airing January 8, 2021, after over 36 years in the role. Following his death, a variety of guest hosts completed the season beginning with record-holding former contestant Ken Jennings, each hosting for a few weeks before passing the role on to someone else. Then-executive producer Mike Richards initially assumed the position of permanent host in September 2021, but relinquished the role within a week. Mayim Bialik and Jennings served as permanent rotating hosts of the syndicated series until December 2023, when Jennings became the sole syndicated host. While Bialik was originally arranged to host additional primetime specials on ABC, and spin-offs, the announcement of Jeopardy! Masters in 2023 meant these duties were shared as well. Following Bialik's withdrawal in part of supporting writers and actors due to the 2023 Hollywood labor disputes, Jennings assumed hosting duties for all forms of media.

Currently in its 42nd season, Jeopardy! is one of the longest-running game shows of all time. The show has consistently enjoyed a wide viewership and received many accolades from professional television critics. With over 9,000 episodes aired, the daily syndicated version of Jeopardy! has won a record 45 Emmy Awards as well as a Peabody Award. In 2013, the program was ranked No. 45 on TV Guide's list of the 60 greatest shows in American television history. Jeopardy! has also gained a worldwide following with regional adaptations in many other countries.

Each game of Jeopardy! features three contestants competing in three rounds: Jeopardy!, Double Jeopardy!, and Final Jeopardy! In each round, contestants are presented trivia clues phrased as answers, to which they must respond in the form of a question that correctly identifies whatever the clue is describing. For example, instead of asking, "Who is the only U.S. President to marry in the White House?" and the answer being "Grover Cleveland", the clue is "He is the only U.S. president to marry in the White House" and the contestant would respond by asking "Who is Grover Cleveland?"

The Jeopardy! and Double Jeopardy! rounds each feature game boards consisting of six categories with five clues each. The clues are valued by dollar amounts from lowest to highest, ostensibly by difficulty. The values of the clues increased over time, with those in the Double Jeopardy! round always being double the range of the Jeopardy! round. On the original Jeopardy! series, clue values in the first round ranged from $10 to $50 in the Jeopardy! round and $20 to $100 in Double Jeopardy! On The All-New Jeopardy!, they ranged from $25 to $125 and $50 to $250. The 1984 series' clue values originally ranged from $100 to $500 in Jeopardy! and $200 to $1,000 in Double Jeopardy! These ranges were increased to $200–$1,000 and $400–$2,000, respectively, on November 26, 2001.

Gameplay begins when the returning champion selects a clue by indicating its category and dollar value. The two (or if there is no returning champion, three) challengers participate in a random draw prior to taping to determine contestant order, and if there is no returning champion, the contestant who drew the first lectern starts. The underlying clue is revealed and read aloud by the host, after which any contestant may ring in using a lock-out device. The first contestant to successfully ring in is prompted to respond to the clue by stating a question containing the correct answer to the clue. Any grammatically coherent question with the correct answer within it counts as a correct response. If the contestant responds correctly, its dollar value is added to the contestant's score, and they may select a new clue from the board. An incorrect response or failure to respond within five seconds deducts the clue's value from the contestant's score and allows the other contestants the opportunity to ring in and respond. If the response is not technically incorrect but otherwise judged too vague, the contestant is given additional time to provide a more specific response. Whenever none of the contestants ring in and respond correctly, the host gives the correct response, and the player who selected the previous clue chooses the next clue. Gameplay continues until the board is cleared or the round's time length expires, which is typically indicated by a beeping sound.

The contestant who has the lowest score selects the first clue to start the Double Jeopardy! round. Since 2021, if there is a tie for the contestant with the lowest score, the contestant with the last correct question among the tied players selects first.