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A Spectrum Analyzer is an instrument used to measure and display the frequency spectrum of electrical signals. It analyzes the amplitude of signals as a function of frequency, allowing users to identify and evaluate the presence of various frequencies within a signal. Spectrum analyzers are essential in telecommunications, audio engineering, and research for assessing signal quality, detecting interference, and optimizing performance in communication systems. They provide valuable insights into the spectral content of signals, making them critical for troubleshooting and analysis.