Why errors are growing beyond courant number limit?

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Errors are increasing beyond the Courant number limit due to the dependence on the numerical scheme applied to the problems. Stability of the scheme is influenced by specific properties that affect its behavior during Fourier analysis. To determine the stability of a numerical scheme, a von Neumann stability analysis is necessary. This analysis helps identify whether the scheme leads to stable or unstable regions. Understanding these concepts is crucial for effective numerical simulations.
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why errors are growing beyond courant number limit? i know that it depends on the scheme which we applied to the problems. But why it is ? which property leads it to stable or unstable region during Fourier analysis?
 
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