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Noise may refer to:
Unwanted random fluctuations or disturbances in a physical system (e.g., electrical noise).
Unwanted sound or unwanted acoustic energy, often contrasted with desired speech or music.
In communications and signal processing, random or unwanted components that degrade signal quality.
Noise is also used as a name for music/art projects and releases; without context, the term may refer to specific artists or works.