This report provides a detailed analysis of IT infrastructure, encompassing the roles and responsibilities of an IT infrastructure manager, the various components that constitute an IT system (hardware, software, network, and human resources), and the benefits of virtualization and cloud computing. The report explores the concept of dynamic scaling of applications within a cloud environment, highlighting how it supports efficient resource allocation. Furthermore, it addresses the security challenges associated with cloud computing, including data theft, access control issues, and the need for continuous monitoring. The report emphasizes the economic advantages of cloud computing and virtualization, and its impact on improving organizational agility and efficiency. This report is designed to provide a comprehensive understanding of IT infrastructure, relevant to the current technological landscape.