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A diode is used for:
1. Rectification
2. can be used as a switch (but it is not an ideal switch.)
we use a diode in rectifier circuit for pure dc voltage
Check these:
http://www.instructables.com/id/How-To-Diodes/?ALLSTEPS
https://learn.sparkfun.com/tutorials/diodes/diode-applications
in different types of electric circuits solar cells, rectifiers ,led,amplifiresand others