Cloud Computing Technology Training Online

Gartner defines cloud computing as "a style of computing in which massively scalable IT-related capabilities are provided 'as a service' using Internet technologies to multiple external customers." This means clouds have self-service interfaces with multiple customers who can acquire resources at any point of time and dispose them when their need is fulfilled.

Cloud by its nature is "on-demand" and includes attributes previously associated with utility and grid models. Cloud actually combine the attributes of all these to create a more useful IT delivery paradigm.

Public cloud is an easily accessible and multi-tenant virtualized infrastructure that anyone can tap into through a self-service portal. These are like shared infrastructures.

A private cloud is similar to public cloud but has an in-built firewalls for use by only an enterprise’s users.

Facebook, Google mail, Apple iCloud, LinkedIn, Disqus, Dropbox, Salesforce, Amazon web services (AWS), Hotmail and Box.net

 These are three categories of public cloud services.

• SaaS = Software-as-as-service is a software delivery method that provides access to software and its functions remotely as a Web-based service.
• PaaS = platform-as-a-service is a category of cloud computing that provides a platform and environment to allow developers to build applications and services over the internet.
• IaaS = infrastructure-as-a-service is a standardized, highly automated offering, where compute resources, complemented by storage and networking capabilities are owned and hosted by a service provider and offered to customers on-demand.