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The term Unplugged has become a term used to describe music usually heard on amplified instruments such as electric guitar and synthesizer that is rendered instead on instruments that are not electronically amplified, for example acoustic guitar or traditional piano, although a microphone is still used.

The word became incorporated into the title of a popular MTV series that began in the 1989/1990 US TV season, MTV Unplugged, on which musicians performed acoustic or "unplugged" versions of their familiar electric repertoire. Many of these performances were subsequently released as albums, often featuring the title Unplugged.

(...)The underlying concept behind the Unplugged series has been attributed to the popularity among musicians of a variety of informal musical performances on stage, film, television and record in earlier decades. The casual "in-the-round" sequence in Elvis Presley's 1968 Comeback Special, and The Beatles informal studio jams documented in the 1970 film Let It Be were both precursors of the "Unplugged" concept, though they were neither conceived nor promoted as such at the time they occurred.
http://en.wikipedia.org/wiki/M(...)ugged