What is cloud computing?

Could someone explain it in detail for me?What is cloud computing?
Most people accept the NIST definition of cloud computing to describe what it is. In general though remember is is about services.



5 characteristics:

- Broad access from any device even wireless

- Self service to use and stop using on demand

- Elastic scales up and down appearing to be limitless

- Pooled resources for multiple customers sharing

- Measured service paying only for what you use



4 Service Models Each having the characteristics above

- IaaS is Infrastructure as a service where you control the configuration even the o/sand maybe networks

- PaaS is platform as service where you can configure and build things on top of the IaaS and includes tools for development salesforce, google and others



Deployment models

Public, Pirvate, Hybrid are straight forward as their name suggests



Much more detail at the resources and some simplified visuals
Let us simplify this with a simple example: Gmail is a cloud service. Having said that, this doesn't mean that any service hosted on the web is a cloud service. Cloud Computing Services must have following 5 attributes:



---available everywhere i.e. uses Internet technologies, hassle-free, in most cases no installations/downloads etc.

---available on demand i.e. metered like your electric bills.

---can be accessed on any device i.e. device independent.

---Resource Sharing i.e Multi-Tenant (ability of the software to be offered to multiple users),

---Scalable %26amp; Elastic i.e. capacity can be sized up or sized down with in minutes, based on demand. Your business is growing you spin up more servers %26amp; pay only for whatever you use. Come recession %26amp; if your business is shrinking use less number of servers %26amp; pay less. This is as simple %26amp; quick as a simple configuration/settings. (No need to buy infrastructure which may lie idle/unproductive once your business doesn't require them)



A common user will use Cloud SaaS (Gmail, Dropbox etc). Developers %26amp; techies use Cloud IaaS (hosting infrastructure) %26amp; PaaS (development environment).What is cloud computing?
Do your own homework .



look it up on Wikipedia.

Cloud is where IT is provided as a total service, rather than have servers %26amp; storage on site. it is all done off site at another location,

like all the US military computing is done in China where all the IT equipment is located.. that would work really well......
If you have ever used Google Docs...then this is cloud computing. Rather than storing files and documents for example on your own computer, you are storing the in the "cloud" meaning a file/data server over the internet.What is cloud computing?
It's when the processing and storage of information take place on a remote server and you can access it from any computer over a network connection.