Dive into the fundamentals of P–N junctions, the heart of every diode and semiconductor device. In this concise presentation, Dr. G.S. Virdi (Former Chief Scientist, CSIR-CEERI Pilani) covers: What Is a P–N Junction? Learn how P-type and N-type materials join to create a diode. Depletion Region & Biasing: See how forward and reverse bias shape the voltage–current behavior. V–I Characteristics: Understand the curve that defines diode operation. Real-World Uses: Discover common applications in rectifiers, signal clipping, and more. Ideal for electronics students, hobbyists, and engineers seeking a clear, practical introduction to P–N junction semiconductors.