Frequency Domain Analysis is a method used to analyze signals by transforming them from the time domain to the frequency domain. This transformation allows us to see how much of the signal's energy is present at different frequencies. Techniques like the Fourier Transform are commonly used to perform this analysis, making it easier to identify patterns and characteristics in the data. In the frequency domain, signals can be represented as a sum of sinusoidal components, each with a specific frequency and amplitude. This representation is useful in various fields, including engineering, audio processing, and communications, as it helps in filtering, compression, and understanding the behavior of complex systems.