What are Cathode and Anode?
The terms cathode and anode are commonly used in the field of chemistry and physics to describe the two electrodes in an electrochemical cell or device.

Cathode:
- The cathode is the electrode where reduction occurs during a chemical reaction.
- Electrons are gained at the cathode, resulting in a positive charge.
- In an electrolytic cell, the cathode is connected to the negative terminal of the power supply.
- In a galvanic cell, the cathode is where the positive end of the external circuit is connected.

Anode:
- The anode is the electrode where oxidation occurs during a chemical reaction.
- Electrons are lost at the anode, resulting in a negative charge.
- In an electrolytic cell, the anode is connected to the positive terminal of the power supply.
- In a galvanic cell, the anode is where the negative end of the external circuit is connected.

Key Differences:
- Cathodes are associated with reduction reactions, while anodes are associated with oxidation reactions.
- Electrons flow from the anode to the cathode in an electrochemical cell.
- The polarity of the power supply determines which electrode functions as the anode and cathode in an electrolytic cell.
In conclusion, understanding the roles of cathodes and anodes is crucial in the study of electrochemistry and the functioning of various devices such as batteries, fuel cells, and electrolysis cells.