System integration is the process of combining different systems and software applications into a single unified system. It is a process of connecting different components of a system, such as hardware, software, databases, and networks, to ensure that they all work together as a single unit. System integration is a critical part of any IT system, as it allows organizations to get the most out of their technology investments. System integration helps organizations to improve efficiency, reduce costs, and increase productivity. It also helps to ensure that data is secure and accessible, and that systems are compatible with each other. System integration is a complex process that requires careful planning and implementation. It requires the coordination of multiple stakeholders, including IT professionals, software developers, and business users. The goal of system integration is to create a unified system that is reliable, secure, and efficient.