For simple term, cloud computing means to store data and software ofer the internet.
So it is none about your hard drives, not about having a dedicated server in residence,
It is not about managing hardware and software, that will be the responsibility of the vendor and also with updates, the shared infrastructures stand for you pay what you need.Updates and upgrades are automatic, and scaling Up or own is easy.
With cloud app, all we need is a browser, log in to server, and stat using what we need.
There are characteristic of cloud computing such as:
1 On Demand ; resource should be always available when needed. and also controllable for turning on or off so there will be no lack or wastages of using it.
2. Scalable ; should be able on scaling (increase or decrease) of the resource when necessary.
3. Multi tenant ; while we share the same resource, the provider should be ensure the security of ecah tenant's datas
4. Self service computation and storage resource ; all related proccess should be self-service and automated, involving less manual proccessing.
It's means when the hosted service is failed, the cloud provider should be able to fail-over the service immediately.
5. Reliability ; provider committing to uptimes of their service
6. Utility-based subscription ; paying just like paying electricity bill, no investment required.
So, service models in cloud computing divide as;
1. Infastructure as a Service (IaaS) ; vitual machine, servers, storages, load balance, network
2. Platform as a Service (PaaS) ; execution of runtime, databases, web server, development tools
3. Software as a Service (SaaS) ; CRM, emails, virtual desktop, Dashboard, communication, games, ...
4. Network as a Service (NaaS)
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