cloud computing is the latest technology in IT field. Basicaly cloud computing is a hosted services deliverd on the internet. cloud computing fulfil the all needs of IT. It is a way to increasing capacity or capability of the company without investing in new infrastructure,training new personnel or licensing new software. Cloud computing based on pay per use service, in real time over the internet, extends IT's capabilities. Cloud computing services are broadly divided in to three categories: Infrastructure-as-a-service(Iaas), Platforam-as-a-service(PaaS), Software-as-a-service(Saas). The name Cloud computing inspired by cloud symbol that often used to represent the internet in flowchart and diagrams.
Mainly cloud computing have three unique characterstics: first It is sold on demand, typically by minute or the hour; Second It is elastic means a user can use the service as per their requirement. Third is services is fully manged by the provider means the consumer or a user needs nothing but a personnel computer and internet acess.
A cloud can be public or private . A public cloud provide service to everyone on internet like AMAZON web services is the largest public cloud provider. A private cloud is a proprietary network or a data centre that provide hosted services to limited number of people like any indrustry or company have there many branches in diffrent cities and they have to share one data among all branches than the wolud create there own private cloud which also secure for there company. When a service provider uses public cloud resources to create private cloud that cloud is known as virtual private cloud. Private or public the goal of cloud computing is to provide easy and scalable acess to computing resources and IT sevice