Cloud technology usually refers to cloud computing, in which large clusters of networked servers provide large-scale access to software and other computer resources and centralized mass data storage. Clouds can be public and therefore available for a fee to anyone on the Internet, or they can be private, closed and proprietary or hybrids.
According to SearchCloudComputing.com, cloud service has three major characteristics: It ‘s available on demand, usually by the hour or minute; it’s elastic, so users can use as much or as little of the service as they want at a given time; and cloud services are managed by their providers. Services are divided into three broad categories, including IaaS, which is Infrastructure-as-a-Service; PaaS, or Platform-as-a-Service; and SaaS, which stands for Software-as-a-Service.
The great advantage of cloud technology is that it’s easily and economically scalable. Because clouds are so cost-effective for providers, for instance, larger groups of users can access computerized resources to start businesses, telecommute and support online sales than would be possible if any one business had to provide these services on the ground. As a kind of grid computing, which involves networked computers working together to perform very large tasks, cloud computing continues to evolve by addressing three fundamental issues: quality of service, reliability and security. Although cloud computing represents an acceptable trade-off for many people as of 2014, it’s still considered experimental.