Answer Description
Cloud Infrastructure, like all infrastructure, still requires special care to ensure it's security. Some of the benefits of Cloud Infrastructure are the pay-as-you-go model (usually per second or per minute billing), flexibility to create and delete servers on demand or automatically and the ease of provisioning complex services like database clusters without highly specialized experts.
Wikipedia
Cloud computing is the on-demand availability of computer system resources, especially data storage (cloud storage) and computing power, without direct active management by the user The term is generally used to describe data centers available to many users over the Internet Large clouds, predominant today, often have functions distributed over multiple locations from central servers If the connection to the user is relatively close, it may be designated an edge server Clouds may be limited to a single organization (enterprise clouds), or be available to many organizations (public cloud) Cloud computing relies on sharing of resources to achieve coherence and economies of scale
Cloud_computing - Wikipedia, the free encyclopedia