Quantum correlation techniques, particularly quantum entanglement and quantum discord, have emerged as critical enablers in the evolution of advanced computing and secure communication systems. These phenomena, rooted in the principles of quantum mechanics, allow for non-classical correlations between particles that classical systems cannot replicate. By leveraging these quantum correlations, researchers and engineers can build systems that surpass the capabilities of traditional computing architectures and cryptographic methods. In quantum computing, quantum correlations serve as a backbone for performing complex calculations with unprecedented speed and efficiency. This paper explores the theoretical foundations of quantum correlations and their practical applications in computing and communication. It also investigates current technological advancements and experimental implementations in quantum information science. Furthermore, the paper discusses the challenges, such as decoherence and scalability, that hinder the widespread deployment of quantum-based systems and highlights ongoing research aimed at overcoming these barriers. Keywords: Quantum Correlations, Quantum Entanglement, Quantum Computing, Quantum Communication, Quantum Cryptography, Quantum Key Distribution, Secure Data Transmission, Quantum Algorithms, Quantum Information Processing