Linked from
The 26 pages that link to Nyquist–Shannon sampling theorem, each with the reason it gives.
Digital imageRelated: It explains when spatial sampling can preserve image detail without aliasing.
AliasingRelated: Its sampling-rate limit identifies when frequency aliasing can occur.
Analog signalRelated: It establishes conditions for accurately digitizing analog signals.
Spectral resolutionRelated: It constrains how finely a resolved spectrum must be sampled digitally.
ModemRelated: Digital receivers sample incoming waveforms to estimate the transmitted symbols.
High resolutionRelated: It sets a sampling limit on the spatial frequencies an image can represent.