Cloud Computing is a technology that allows users to access data and applications over the internet. It is a way of storing, managing, and processing data on remote servers hosted on the internet instead of on local servers or personal computers. Cloud Computing provides users with the ability to access their data and applications
From Wikipedia
Cloud computing is defined by the International Organization for Standardization (ISO) as "a paradigm for enabling network access to a scalable and elastic pool of shareable physical or virtual resources with self-service provisioning and administration on demand". It is commonly referred to as "the cloud".