How is fronting and tailing observed in chromatography?

Fronting and tailing in chromatography are observed as distortions in the shape of the peaks on the chromatogram. Fronting occurs when the peak is broader and taller than expected, while tailing occurs when the peak is elongated and skewed. These distortions can be caused by factors such as sample overload, column overloading, or interactions between the sample and the stationary phase.