There are six main characteristics of the Cloud model.
1. Self-service - A user can create their own computing resources (software, operating system, or server) within minutes of deciding they need it. This can be done without any help from a technician, usually through a self-service portal on the web.
2. Standardized - Delivers functions and processes that are largely the same to multiple users, across multiple companies or enterprises, across many different industries, and in diverse geographies.
3. Access from Anywhere - A user can access the computing resources from wherever they need it as long as they are connected to the network or internet. This allows the usage from any device, such as cellular phones, tablets, desktops, or laptops.
4. Pay-Per-Use or As You Go - Users of the computing resources pay based on their use of the resource.
5. Shared Pool of Resources - Multi-tenant – a tenant is defined by the service model or type of cloud being used. (therefore can be either a department, organization, company, end user). Many clients can access the same Cloud, but they will be securely separated by the use of virtualization.
6. Can Scale Up/Down - Computing resources can scale up or down based on the users needs. This can be based on triggers that will automatically scale up or down the resource.
https://www.ibm.com/blogs/cloud-computing/2014/01/cloud-computing-defined-characteristics-service-levels/
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