A spectrum analyzer is an electronic device used to measure and display the frequency spectrum of signals. It shows how much of a signal's power is present at different frequencies, allowing users to visualize the amplitude of signals across a range of frequencies. This tool is essential in various fields, including telecommunications, audio engineering, and broadcasting, as it helps identify and troubleshoot issues in signal transmission. Spectrum analyzers can be either hardware devices or software applications. They are commonly used to analyze radio frequencies, audio signals, and other waveforms. By providing a graphical representation of the signal, spectrum analyzers assist engineers and technicians in optimizing performance and ensuring compliance with regulatory standards related to radio frequency emissions and audio quality.