The electrodes of a semiconductor diode are known as:

A semiconductor diode is a two-terminal electronic component. These two terminals, or electrodes, are known as the anode (the positive terminal) and the cathode (the negative terminal). Current conventionally flows from the anode to the cathode. The other options list terminals for different types of electronic components. "Gate and source" (along with drain) are the terminals of a Field Effect Transistor (FET). "Collector and base" (along with emitter) are the terminals of a Bipolar Junction Transistor (BJT). Knowing the correct naming convention for diode pins is essential for understanding circuit diagrams and installing components with the correct polarity.