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The zero order hold is mathematical model of the practical signal reconstruction line by a Conventional Digital to analog converter.  The effect of converting a discrete time signal to a continuous time signal by holding each sample value for one sample interval.   Rectangular impulse response are low pass filter at. 

The process of converting an analog signal into a Discrete signal or making an analog signal to occur at particular interval of time is known as sampling.  Type of sampling Theorem a) ideal sampling b) Natural sampling c) Flat tap sampling A continuous time signal may be completely represent in its samples and recovered back if the sampling frequency is greater than 2fm Where,        Fs-is the sampling frequency       Fm-is the maximum frequency  A band Limited signal frequency at.  Sampling of the signal is the fundamental operation in the signal processing.  A continues time signal is first converted  into discrete time signal sampling process.