Frequency offset refers to the difference between the actual frequency of a signal and the intended or nominal frequency it was supposed to be at. In wireless communication systems, frequency offset can occur due to various factors such as oscillator inaccuracies, Doppler effects, and noise interference. Correcting for frequency offset is crucial for maintaining the reliability and efficiency of communication systems, as it can lead to signal distortion, degradation in performance, and interference with neighboring channels. Researchers in this area focus on developing algorithms and techniques to accurately estimate and compensate for frequency offset in order to improve the overall performance of wireless communication systems.