What is rectification and rectifier?

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(N/A) Rectification is the process of converting an alternating current $(AC)$ into a direct current $(DC)$.
$A$ rectifier is an electrical device that performs the process of rectification.
It typically uses one or more $p-n$ junction diodes,which allow current to flow in only one direction,thereby blocking the reverse half-cycle of the $AC$ input.

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