Concentration was an American TV game show

Game show

A game show is a type of radio or television program in which members of the public, television personalities or celebrities, sometimes as part of a team, play a game which involves answering questions or solving puzzles usually for money and/or prizes...

 based on the children's memory game

Concentration (game)

Concentration, also known as Memory, Pelmanism, Shinkei-suijaku, Pexeso or simply Pairs, is a card game in which all of the cards are laid face down on a surface and two cards are flipped face up over each turn. The object of the game is to turn over pairs of matching cards...

 of the same name. Matching cards represented prizes that contestants could win. As matching pairs of cards were gradually removed from the board, it would slowly reveal elements of a rebus

Rebus

A rebus is an allusional device that uses pictures to represent words or parts of words. It was a favourite form of heraldic expression used in the Middle Ages to denote surnames, for example in its basic form 3 salmon fish to denote the name "Salmon"...

 puzzle that contestants had to solve to win a match.

The show was broadcast on and off from 1958 to 1991, presented by various hosts, and has been made in several different versions.