High fidelity refers to high-quality sound reproduction, typically in reference to music or sound systems. Synonyms for this phrase include "hi-fi," which is short for high fidelity, "high-quality sound," "high-fidelity audio," "high-fidelity sound," "high-fidelity reproduction," "high-fidelity playback," and "high-fidelity music." These phrases all refer to the same concept of high-quality sound and audio reproduction. The term "high fidelity" has been around since the 1940s, and since then, it has become synonymous with high-quality music and sound systems. With technological advancements, high fidelity has become more accessible and affordable to everyday consumers.