Quantum correlations, particularly entanglement, represent a paradigm shift in computational and cryptographic capabilities. This study explores the foundational principles of quantum entanglement and its transformative applications in quantum computing, cryptography, and networked systems. By integrating theoretical models, computational simulations, and experimental validations, the research addresses critical challenges such as decoherence, scalability, and error correction in quantum technologies. The investigation highlights entanglement’s role in enabling exponential computational speedups through algorithms like Shor’s factorization and Grover’s search, while also securing communication via Quantum Key Distribution (QKD) protocols. Case studies demonstrate practical implementations, including quantum teleportation in networks and entanglement-based error correction in superconducting qubit architectures. Despite advancements, limitations such as environmental noise and hardware fidelity persist, necessitating innovations in quantum materials and hybrid quantum-classical systems. This work underscores the urgency of advancing quantum technologies to address global security and computational challenges, positioning entanglement as the cornerstone of next-generation innovations. Keywords: Quantum Entanglement, Quantum Computing, Quantum Cryptography, Quantum Networks, Quantum Key Distribution (QKD), Decoherence