Introduction to Cloud Computing

What is cloud computing?

Large group of remote servers networked to allow centralize data storage and online access to computer services or resources. (Wikipedia). Cloud computing can be classified as private, public and hybrid.

Fundamental models 

Infrastructure as a service (IaaS)

Provides Virtual Machines, Servers, Storage, Load balancer's etc.

Platform as a service (PaaS)

Typically provides execution runtime, database, web server

Software as a service (SaaS)

Provided access to software and databases. Cloud provider manages the infrastructure. Also known as On demand software. Usually priced pay per use. 

Deployment models

Private cloud

Typically used for a single organization 

Public cloud

Open for public use. Technically there may not be any difference between between private and public clouds however security considerations are different. 

Web Server, Garden and Farm

Web Garden scales across multiple processes

Web Farm scales across multiple servers

Hybrid Cloud

Some of the enterprise software companies include
Hewlett Packed Enterprise - https://www.hpe.com/

Web Farms in IIS

Web Farm Framework - IIS

CodeProject - Difference between Web farm and garden

SO - Difference between Web Garden and Farm