What are the various types of Cloud Computing models?

Cloud computing works as a software design that is based on applications that stores data on remote servers accessible through the internet. To better comprehend how cloud computing works, the front-end and back-end can be separated.

The front end allows a user to access data stored in the cloud using an internet browser or cloud computing software. The backend, on the other hand, is the most crucial component of cloud computing because it is in charge of securely storing data and information. It includes computers, databases, servers, and central servers.

The central server facilitates operations by following a set of protocols. It makes use of middleware software to ensure that cloud-connected devices and PCs are always connected. Many copies of data are routinely kept by cloud computing service providers to protect against data breaches, security threats, and data loss, among other things.

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'Cloud Computing' can be delivered in various ways.

• On-Premise;
• Infrastructure-as-a-Service (IaaS);
• Platform-as-a-Service (PaaS);
• Software-as-a-Service (SaaS);
• Business-Process-as-a-Service (BPaaS).

The following are the primary factors that are influenced by each of these forms of cloud computing:

• Flexibility;
• Control;
• Management simplicity;
• Vendor lock-in.

1. On-Premise:

This option is ideal for corporations or businesses that want complete control over their data as well as the freedom to set up their Cloud exactly how they want it to run. You have complete control over your Cloud setup's hardware, network, and environment. This means that you don't have to entrust your data to third parties if you don't want to. On-premise may be the most expensive alternative because you won't be able to benefit from the economies of scale that a Cloud provider may supply. You may need to purchase a cluster with extra capacity that you won't utilise, and you'll need in-house expertise to operate the Cloud.

Flexibility : High

Control : High

Management Simplicity : Low

Vendor Lock-In : Low

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2. IaaS:

Infrastructure-as-a-Service (IaaS) for running your own application and operating system is rented as a service. It gives you reasonable control over your infrastructure while still allowing you to be flexible, resulting in lower complexity and management expenses. While you don't have direct control over the underlying hardware, network, or virtualization, you can still install and administer your own operating system and the applications that run on the infrastructure.

Flexibility : Medium

Control : Medium

Management Simplicity : Medium

Vendor Lock-In : Medium

3. PaaS:

Platform-as-a-service (PaaS) allows you to host your own bespoke application, with the provider taking care of everything except your application and data. They supply the infrastructure, operating system, and services needed to operate your app. If you have an application built for a specific PaaS platform, PaaS is ideal since it eliminates the need for you to worry about hardware, networking, or managing the OS and underlying software to operate your application. You can concentrate on the development of your app and easily grow up as you need more resources.

Flexibility : Low

Control : Low

Management Simplicity : High

Vendor Lock-In : High

4. SaaS:

Software-as-a-Service (SaaS) doesn’t make you bother about running anything underneath the programme, such as the infrastructure, OS, or services, because the complete application is delivered to you in a hosted format. In terms of management, this is the simplest, but it is also the least versatile.

Flexibility : Very Low

Control : Very Low

Management Simplicity : Very High

Vendor Lock-In : Extremely High

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5. BPaaS:

Any form of a horizontal or vertical business process that is supplied using the Cloud services paradigm is known as Business-Process-as-a-Service (BPaaS). As a result, Cloud services such as Software-as-a-Service (SaaS), Platform-as-a-Service (PaaS), and Infrastructure-as-a-Service (IaaS) rely on associated services.

BPaaS is defined by the following characteristics:

• The BPaaS is built on top of the three core Cloud services: SaaS, PaaS, and IaaS.
• A BPaaS service can be customised according to the process being designed.
• A BPaaS service must have well-defined APIs so that it may be connected to other services easily;
• Because a corporation cannot foresee how a business process will be used in the future, a BPaaS must support numerous languages and deployment settings.
• A BPaaS environment must be able to scale indefinitely. From managing a few processes for a few clients, the service must be able to manage hundreds, if not thousands, of customers and processes. This goal is achieved by optimising the underlying Cloud services to support this level of elasticity and scaling.

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