Explain Diode with neat diagram.

A diode is a two-terminal electronic component that allows current to flow in one direction while blocking it in the opposite direction. It is a fundamental component in electrical and electronic circuits, widely used for rectification, switching, signal modulation, and protection purposes.  

### Symbol and Structure of Diode  
A diode consists of two regions, the P-type and N-type semiconductor materials, forming a PN junction. The symbol of a diode includes an arrowhead (representing conventional current direction) and a bar (representing blocking of reverse current). The terminals are:  
- Anode (A) – Connected to the P-type material  
- Cathode (K) – Connected _____ ________ _____ ___ __________ _________ _______ ___ ___ _____.
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