  Quantum communication represents a revolutionary advancement over classical
information theory, which leverages unique quantum mechanics properties like
entanglement to achieve unprecedented capabilities in secure and efficient
information transmission. Unlike bits in classical communication, quantum
communication utilizes qubits in superposition states, allowing for novel
information storage and processing. Entanglement, a key quantum phenomenon,
enables advanced protocols with enhanced security and processing power. This
paper provides a comprehensive overview of quantum communication, emphasizing
the role of entanglement in theoretical foundations, practical protocols,
experimental progress, and security implications. It contrasts quantum
communications potential applications with classical networks, identifying
areas where entanglement offers significant advantages. The paper explores the
fundamentals of quantum mechanics in communication, the physical realization of
quantum information, and the formation of secure quantum networks through
entanglement-based strategies like Quantum Key Distribution (QKD) and
teleportation. It addresses the challenges of long-distance quantum
communication, the role of quantum repeaters in scaling networks, and the
conceptualization of interconnected quantum networks. Additionally, it
discusses strides towards the Quantum Internet, Quantum Error-Correcting codes,
and quantum cryptographys role in ensuring secure communication. By
highlighting the role of entanglement, this paper aims to inspire further
research and innovation in secure and efficient information exchange within
quantum networks.
