Types of cloud computing services
According to their location:

a) Public clouds, which can be free or paid, and are available to anyone who is interested in using them.

b) Private clouds, which make use of in-house servers to store the company data.

c) Hybrid clouds, which are a combination of public and private clouds. Some companies prefer to use in-house servers to store sensitive data, and public clouds, which are cost-effective and easier to maintain, to archive and store less important data.

d) Community clouds, which are the result of a collaborative effort. In this case, several organization share their cloud computing resources, managing them together.

According to the offered service:

a) IaaS (Infrastructure as a Service), is the lowest-level cloud computing service, providing the needed infrastructure that is required by an external application. IaaS is a cost-effective solution for projects which require a huge computing power, large scale data backups, etc.

b) PaaS (Platform as a Service) is used as a basic platform which allows the users to build custom applications, providing them the needed hardware, an operating system and several software development tools.

c) SaaS (Software as a Service) is a high-level cloud computing service. With this option, a fully functional application can be accessed through a web browser. Office 365 is one of Microsoft's SaaS products, for example.

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