What exactly is cloud computing? and models of cloud computing

The cloud is included plenty of remote servers that hosted about the everywhere. It is the delivery of on-demand computing services. Using cloud computing, users can access software and applications from wherever they want, even though it is being hosted by some other party. One benefit of utilizing cloud-computing services is firms can prevent the upfront cost and complexity of owning and their particular IT infrastructure, and instead simply spend on the things they use once they utilize it. With cloud computing, you don’t desire to make large upfront investments in hardware and spend time and effort for the hard work of managing that hardware.
The principle great things about cloud-computing are :
1. Trade capital expense for variable expense
2. Stop guessing capacity
3. Go global in seconds
4. Take advantage of massive economies of scale
5. Increase speed and agility
6. Stop purchasing running tweaking data centers

The key varieties of cloud-computing or you can say cloud-computing services :

Software being a service (SaaS) –
Getting managed by others which connect with users’ computers online and, usually, an internet browser.
Platform being a service (PaaS) – can be a complete development and deployment environment within the cloud, with resources which allow you to deliver from simple cloud-based apps to classy, cloud-enabled enterprise applications.
Infrastructure like a service (IaaS) – Provides companies with computing resources including servers, networking, storage, files center space on the pay-per-use basis.

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