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A spectrogram is a time-varying spectral representation (forming an image) that shows how the spectral density of a signal varies with time.

Also known as spectral waterfalls, sonograms, voiceprints, or voicegrams, spectrograms are used to identify phonetic sounds, to analyse the cries of animals; they were also used in many other fields including music, sonar/radar, speech processing, seismology, etc. The instrument that generates a spectrogram is called a spectrograph and is equivalent to a sonograph.

Source: Wikipedia – Spectrogram