Quantum communication networks (QCNs) are a game-changer for secure and fast information transfer by using the principles of quantum mechanics to achieve unbreakable encryption and incredibly speedy data transmission. In this chapter, we will explain the basic concepts of quantum entanglement, quantum key distribution (QKD), and teleportation, which are essential for understanding QCNs; discuss the integration of QCNs with traditional communication systems, scalability challenges, and error correction methods; explore recent advancements in satellite-based quantum communication, quantum repeaters, and how artificial intelligence can enhance quantum network performance and discuss future possibilities such as the creation of a global quantum internet, potential uses in cybersecurity, and its impact on advanced computing and IoT systems. Our goal is to provide researchers a complete understanding of QCNs so they can continue to innovate in this rapidly changing field.