Question

Explain models of cloud computing.

Answer 1

• Cloud Computing is the on-demand availability of computer system without direct active management by the user.
• There are three primary service models of cloud computing that are Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS).
• Infrastructure as a Service (laaS):
  (i) IaaS provides automated and scalable environments that provide a high degree of control and flexibility for the user.
  (ii) Instead of purchasing hardware, users pay for IaaS on demand.
  (iii) Examples: Amazon web services (AWS), Microsoft Azure VM, Google Compute Engine (GCE)
• Platform as a Service (PaaS):
  (i) A service provider offers access to a cloud-based environment in which users can develop, manage and deliver applications.
  (ii) PaaS provides a platform with tools to test, develop and host applications in the same environment.
  (iii) Examples: Google App Engine
• Software as a Service (SaaS):
  (i) A service provider delivers software and applications through the internet or an API.
  (ii) Applications are accessible from almost any internet-connected device, from virtually anywhere in the world.
  (iii) Examples: Google's G suite, GitHub, Dropbox.