Infrastructure as a service (IaaS) is an instant computing infrastructure, provisioned and managed over the internet.
IaaS quickly scales up and down with demand, letting you pay only for what you use. It helps you avoid the expense and complexity of buying and managing your own physical servers and other datacenter infrastructure. Each resource is offered as a separate service component, and you only need to rent a particular one for as long as you need it. A cloud computing service provider, such as Azure, manages the infrastructure, while you purchase, install, configure, and manage your own software,operating systems, middleware, and applications.
FEATURES OF IaaS :-
1. Eliminates capital expense and reduces ongoing cost.
IaaS sidesteps the upfront expense of setting up and managing an on-site datacenter, making it an economical option for start-ups and businesses testing new ideas.
2. Improves business continuity and disaster recovery.
Achieving high availability, business continuity and disaster recovery is expensive, since it requires a significant amount of technology and staff. But with the right service level agreement (SLA) in place, IaaS can reduce this cost and access applications and data as usual during a disaster or outage.
3. Respond quicker to shifting business conditions.
IaaS enables you to quickly scale up resources to accommodate spikes in demand for your application, during the holidays, for example,then scale resources back down again when activity decreases to save money.
4. Increase stability, reliability and supportability.
With IaaS there is no need to maintain and upgrade software and hardware or troubleshoot equipment problems. With the appropriate agreement in place, the service provider assures that your infrastructure is reliable and meets SLAs.
5. Better security.
With the appropriate service agreement, a cloudservice provider can provide security for your applications and data that may be better than what you can attain in-house.