The Cloud is basically the Internet (derived from the representation of the Internet as a cloud in engineering diagrams). Cloud computing is the concept of storing, accessing, sharing and manipulating data, applications, and services online using a remote server instead of in-house resources. Google Docs, Gmail, and other Google services and applications are examples of cloud computing that you might already be using.
Bandwidth growth, faster downloads, greater processing horsepower, and the explosion of more potent mobile solutions have all converged to culminate in the rapid evolution of cloud computing. Many experts predict the cloud will eventually overshadow traditional on-site networks.