System integration is the methodological approach and research concept focused on the process of combining disparate software, hardware, and network components into a cohesive, unified infrastructure. As a field, it investigates the principles, methods, challenges, and effects of achieving seamless interaction, data exchange, and coordinated operation among previously separate systems, emphasizing interoperability and complexity management. Its significance lies in enhancing organizational efficiency, productivity, and decision-making through unified data access and process coordination within complex operational environments.