Question

What is the difference between diode and transistor?

Answer 1

A transistor is a three-terminal semiconductor device, whereas a diode is a two-terminal semiconductor device. A diode can allow current to flow in one direction while blocking current flow in the other.

Complete step-by-step solution:
The diode and transistor are regarded as the foundation of electronic devices and circuits.
The major difference between diode and transistor is given as follows,

Diode	Transistor
A diode is a semiconductor device that only allows current to flow in one direction.	The resistance is transferred from the low resistance region to the high resistance region by the transistor.
The diode is used to convert AC to DC or to perform rectifications	the transistor is primarily used for amplification and as a regulator
The anode and cathode terminals of a diode are the same. The positive terminal of the diode is the anode, and the negative terminal is the cathode.	The emitter, collector, and base terminals are the three terminals of a transistor.
The diode is an example of an uncontrolled switch.	The transistor is an example of a controlled switch.
The diode only has one depletion layer between the P and N types.	The transistor has two, one between the emitter and base regions and the other between the base and collector regions.

Note: The diode's two regions are P-type and N-type. The hole is the diode's majority charge carrier in the P-region, and electrons are the diode's majority charge carrier in the N-region. The transistor is divided into three regions: emitter, base, and collector. The base of the transistor is the smallest of the three regions, and the collector is the largest.