High fidelityHigh fidelity or hi-fi refers to the reproduction of sound and image that is very faithful to the original. Hi-fi aims to achieve minimal or unnoticeable amounts of noise and distortion.
The fans of hi-fi are known as audiophiles or videophiles.
See also: Lo-fi
High Fidelity is also the title of a book by Nick Hornby about an audiophile and his relationships.