What is a diode primarily used for?

A diode is primarily used to allow current to flow in only one direction. This characteristic is essential in many electronic circuits, as it helps to control the direction of current, preventing unwanted reverse flow that could damage components or destabilize the circuit.

In practical applications, diodes are often found in power supply circuits, where they convert alternating current (AC) to direct current (DC). This is crucial because many electronic devices require DC to operate correctly. The diode's ability to block reverse current flow ensures that the device receives a stable and correct voltage without the risk of reverse polarity.

This function is fundamental to how various electronic systems achieve rectification, signal modulation, and other essential tasks, highlighting the diode's role as a critical component in the field of electronics.