Time-Frequency Analysis is a technique used to analyze signals that change over time, such as audio or biological signals. It combines both time and frequency information, allowing researchers to see how the frequency content of a signal evolves. This is particularly useful in fields like signal processing and music analysis. One common method of Time-Frequency Analysis is the Short-Time Fourier Transform (STFT), which breaks a signal into small segments and applies the Fourier Transform to each segment. This provides a visual representation, often called a spectrogram, showing how different frequencies are present at various times in the signal.