Rectification: The conversion of AC into DC is known as rectification. A PN junction diode allows electric current when it’s forward biased and blocks electric current when it is reverse biased. This action of PN-Junction diode enables us to use it as a rectifier.
Diodes are used in clamping circuit for DC restoration.
Diodes are used in clipping circuits for wave shaping.
Diodes are used in voltage multipliers.
Diodes are used in demodulation circuits.
Diodes are used in LED display diodes are used in Voltage regulator.
Diodes are used in optical communication and many more.