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In a diode, the anode and cathode have specific and essential functions that contribute to its operation:

1. Anode: This is the positive side of the diode. When a higher voltage is applied to the anode than to the cathode, the diode will conduct. This means that electric current can flow through the diode, from the anode to the cathode. The anode is thus the electrode where the current enters.

2. Cathode: This is the negative side of the diode. The cathode is less positive (or negative) compared to the anode during conduction. When the voltage on the cathode is higher than or equal to that on the anode, the diode blocks the current, and thus no electricity flows.

Operating principle:

• Forward conduction: When the anode is more positive than the cathode (for example, due to an external voltage source connected to the anode), the diode will conduct. This is the normal operating mode of the diode.
• Reverse polarization: When the cathode is more positive than the anode, the diode is driven far back and thus blocks the current.

These properties make diodes extremely useful in electronic circuits for rectifying current, protecting circuits, and controlling the direction of current.