IT infrastructure refers to the combined hardware, software, network resources, and services necessary for the operation and management of an enterprise IT environment. It encompasses servers, storage devices, networking equipment, operating systems, enterprise applications, middleware, and human resources that manage and maintain these components. IT infrastructure is crucial for data storage, networking, security, system administration, and disaster recovery. It ensures efficiency, scalability, reliability, and security, enabling businesses to streamline operations, support growth, protect data, and innovate with new technologies.