Cloud infrastructure consists of virtualized computing resources such as servers, storage, and networking, delivered via the internet. Unlike traditional on-premises setups, cloud infrastructure is hosted in remote data centers managed by cloud service providers. This model allows organizations to access computing power and storage without owning or maintaining physical hardware. As one of the three main types of IT infrastructure, cloud infrastructure provides flexibility, scalability, and cost-efficiency through a pay-as-you-go model. It is particularly suited for businesses that need to adjust resources based on demand and supports services like application hosting, data storage, backups, and disaster recovery.