Services that are placed on the market by Cloud providers can be separated into three basic categories. Those are Software as a Service, Platform as a Service and Infrastructure as a Service.
Software as a Service is a model that works in a way that provider host and maintain one application that runs in a cloud and because of that kind of infrastructure, many users are enabled to use and work with it. For the users, costs are low, because they don’t have to pay server upgrades or license renewal, and for the provider itself the costs are lower because only one instance of the application needs to be hosted. Examples are Google Docs, Google Sheets, salesforce, acrobat.
Platform as a Service is a model that provides user with layers of space for running and developing. That layers are usually operating systems or parts of applications that need to be upgraded by user. Often, PaaS is just a combination of an operating system and servers for applications. Google is also one of the biggest providers of PaaS in the world. Some of the other providers are Azure and force.com.
Infrastructure as a Service
Infrastructure as a Service is a model that gives the client online space, database management, storage systems, networking equipment etc. That kind of model is affordable and reachable to many firms, even the ones that are not making big profits. The users have complete control over their purchased infrastructure, they can manage settings and pay by usage. Some of the most popular providers are Amazon, 3 Tera and GoGrid.
What is the difference of Private and Public Cloud?
Every user (firm, organization) can decide whether their application will be deployed on public, private or hybrid cloud. So what is the best? It is important to know that providers themselves have guidelines that can help users determent what choice to make, and often they are right, but let’s talk about differences between cloud privacies.
Public cloud – they are owned by third parties; in most cases they are interesting to customers because of low price or “pay as you go”, those are big spaces with enormous amount of users but they provide mid-security and settings options for their user. They are not so customizable as the private ones.
Private cloud – has everything that public doesn’t – stronger security and better control for user. They can be On-premise and Externally hosted. On-premise clouds are hosted inside one’s data base. They are restricted by size. Externally hosted clouds are hosted outside of internal data center, they are brought by cloud providers and they are much more secured than public one so firms and organizations often use this type for their computing.
Hybrid Cloud – That is a mix of private and public cloud. User can use the size of public cloud and get some externally hosted part gathered for better computing experience. Because that system is complicated, users need good network connectivity and API compatibility in addition that hybrid works well.
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