In this episode, we explore the BB84 protocol — the first quantum key distribution scheme and a cornerstone of quantum cryptography. We break down how it works, why it matters, and what makes it fundamentally different from classical cryptographic methods. From photon polarization to the principles of quantum uncertainty, we guide you through the key ideas behind secure communication in the quantum age. Whether you're a student, a researcher, or simply curious about quantum technologies, this episode offers a clear and thoughtful introduction to one of the most important protocols in quantum information science.