The term "Cloud Computing" has been created in early 2000s. In short, Cloud Computing means a provision of various computing applications as a service for individuals and large organizations over the Internet.

Unique Features of Cloud Computing:

• On-demand self-service
  • Available for individual and corporate use with a simple set of clicks on computer.
• Centralized security
  • Built in with strong security firewall
• Rapid scalability
  • Easily add or remove utilized services. Essential for workload optimization.
• Cost-effectiveness
  • Charging according to the computing resources needed.
• Broad network access
  • Access, edit, and delete data with any computer device.

Three major cloud service models:

• Software as a Service (SaaS)
• Infrastructure as a Service (IaaS)
• Platform as a Service (PaaS)

Three effective real-world usages:

• Data Storage & Backup
  • Amazon Web Services (AWS)
  • Google Drive
• Communication & Media Production
  • Gmail
  • Zoom
  • YouTube
• Remote team work & management
  • Google Docs, Sheets, Slides, & Colab
  • Slack
  • Trello

The economic model of the cloud computing is PAY-AS-YOU-GO, which means that a customer pays for services only when they use them.