Which of the following is a correct definition of the term rectification?

A. Rectification is the opposition to current flow in a circuit.

B. Rectification refers to the connection of components into a circuit.

C. Rectification is the conversion of AC current to DC current.

D. Rectification involves sensing an electrical quantity and converting it to a signal.

In electronics, rectification is the conversion of alternating current (AC) to direct current (DC). This process can be performed by a diode which is an electrical entity that allows current to flow in one direction but not in the reverse direction. An application of rectification is the research-based development of higher frequency rectifiers under terahertz and light frequencies.