Introduction to Cloud and Cloud computing

Cloud is a distributed collection of servers that host software and infrastructure, and it is accessed over the Internet.

Cloud computing is defined as the use of hosted services, such as data storage, servers, databases, networking, and software over the internet.

For EX- AWS, AZURE, Google Cloud, etc.

Table of Contents

Types of Clouds in Cloud Computing

Types Of Cloud Computing

Let us understand the Types of clouds in detail:

Public Cloud

  • Public cloud is open to all to store and access information via the Internet using the pay-per-usage method.
  • In the public cloud, computing resources are managed and operated by the Cloud Service Provider (CSP). The CSP looks after the supporting infrastructure and ensures that the resources are accessible and scalable for the users.
  • Due to its open architecture, anyone with an internet connection may use the public cloud, regardless of location or company size. Users can use the CSP's numerous services, store their data, and run apps. By using a pay-per-usage strategy, customers can be assured they will only be charged for the resources they use.
  • Example: Amazon Elastic Compute Cloud (EC2), IBM SmartCloud Enterprise, Microsoft, Google App Engine, Windows Azure Services Platform

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Private Cloud

  • Private cloud is also known as an internal cloud or corporate cloud. It is used by organizations to build and manage their own data centers internally or by a third party. It can be deployed using Open-source tools such as Open-stack and Eucalyptus.
  • Examples: VMware vSphere, OpenStack, Microsoft Azure Stack, Oracle Cloud at Customer, and IBM Cloud Private

Hybrid Cloud

  • Hybrid Cloud is a combination of the public cloud and the private cloud. we can say: Hybrid Cloud = Public Cloud + Private Cloud
  • Hybrid cloud is partially secure because the services that are running on the public cloud can be accessed by anyone, while the services that are running on a private cloud can be accessed only by the organization's users. In a hybrid cloud setup, organizations can leverage the benefits of both public and private clouds to create a flexible and scalable computing environment. The public cloud portion allows using cloud services provided by third-party providers, accessible over the Internet.
  • Example: Google Application Suite (Gmail, Google Apps, and Google Drive), Office 365 (MS Office on the Web and One Drive), Amazon Web Services

Community Cloud

  • Community cloud allows systems and services to be accessible by a group of several organizations to share information between the organization and a specific community. It is owned, managed, and operated by one or more organizations in the community, a third party, or a combination of them.
  • In a community cloud setup, the participating organizations, which can be from the same industry, government sector, or any other community, collaborate to establish a shared cloud infrastructure. This infrastructure allows them to access shared services, applications, and data relevant to their community.
  • Example: Health Care community cloud

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  • Multi-cloud is a strategy in cloud computing where companies utilize more than one cloud service provider or platform to meet their computing needs. It involves distributing workloads, applications, and statistics throughout numerous cloud environments consisting of public, private, and hybrid clouds.
  • Adopting a multi-cloud approach allows businesses to have the ability to select and leverage the most appropriate cloud services from different providers based on their specific necessities. This allows them to harness each provider's distinctive capabilities and services, mitigating the risk of relying solely on one vendor while benefiting from competitive pricing models.
  • Examples: Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform (GCP).

Cloud Computing Models

Cloud Computing Models

Let’s understand these models in detail

Software as a Service (SaaS)

  • Software as a Service provides you with a completed product that is run and managed by the service provider. In most cases, people referring to Software as a Service are referring to end-user applications. With a SaaS offering, you do not have to think about how the service is maintained or how the underlying infrastructure is managed; you only need to think about how you will use that particular piece of software. A common example of a SaaS application is web-based email where you can send and receive email without having to manage feature additions to the email product or maintaining the servers and operating systems that the email program is running on.

Platforms as a Service (PaaS)

  • Platforms as a service remove the need for organizations to manage the underlying infrastructure (usually hardware and operating systems) and allow you to focus on the deployment and management of your applications. This helps you be more efficient as you do not need to worry about resource procurement, capacity planning, software maintenance, patching, or any of the other undifferentiated heavy lifting involved in running your application.

Infrastructure as a Service (IaaS)

  • Infrastructure as a Service, sometimes abbreviated as IaaS, contains the basic building blocks for cloud IT and typically provides access to networking features, computers (virtual or on dedicated hardware), and data storage space. Infrastructure as a Service provides you with the highest level of flexibility and management control over your IT resources and is most like existing IT resources that many IT departments and developers are familiar with today.

Benefits of Cloud Computing

  • Flexible costs: Cloud computing spins the table on traditional capital expenditure (capex) spending, instead the majority of cloud spending is operational expenditure (opex). Since a third-party vendor will take care of maintenance, a company does not have to fund a support team to fix problem servers. The upfront costs of infrastructure needs like local server purchases are reduced.
  • Improved mobility: With the cloud, apps and data are accessible anywhere, anytime. And that’s all due to the ever-increasing number of mobile devices like smartphones and tablets. The “anywhere, anytime” benefit also certainly applies to business. Employees gain flexibility, becoming more efficient with workflows and customer service.
  • Increased collaboration: Cloud computing is built to improve work processes, and that includes data flows between coworkers and business partners. Organizations demand more apps for file sharing and streamlined workflows. Remote workers can instantly connect and communicate with fellow employees and important clients.
  • Economies of Scale: Cloud computing reduces costs by leveraging economies of scale. A Booz Allen Hamilton study found that the cloud approach could reduce costs by 50 to 67% for a deployment of 1000 servers. Cloud customers can take advantage of lower costs from vendors’ economies of scale, reducing their investments in on-premises infrastructure.
  • Operational: Technology will never be perfect, but some are just less complex. That includes the infrastructure of cloud computing, which usually runs on separate servers through a third-party vendor. So, when problems do arise, it’s the vendor’s job to promptly fix the problem instead of having on-site IT staff spend time and resources filing claims or updating servers.

Disadvantages of Cloud Computing

  • Downtime: As more companies rely on third-party cloud service vendors, these providers can become overloaded with excessive client requests and may face technical stoppage. Just like any cloud-related outage or lost internet connection, a business can come to a halt with inaccessible apps, data, and servers.
  • Security: Even the biggest and most well-known brands with the best security practices aren’t completely protected from having their data compromised. And storing important, sensitive information on external service clouds is not a foolproof measure, either. There are always loopholes in susceptible systems, especially in public clouds where accessibility is wide open to hackers, careless users, and other vulnerabilities.
  • Limited Control: The cloud offloads much traditional IT maintenance to the cloud service. However, this also leads to less control over IT processes. A company’s application leader will only have access to the front-end management tooling for apps, services, and data, but not the backend infrastructure.

Examples of Cloud Computing

AWS (Amazon Web Service)

  • AWS is a Cloud Computing service
  • AWS is a platform that offers flexible, scalable, reliable, easy-to-use cloud computing solutions
  • The platform is developed with a combination of Infrastructure as a service (IaaS), Platform as a service (PaaS) and Software as a Service (SaaS)


  • Deeply invested in all three levels of the cloud, Microsoft cloud computing – with its Microsoft Azure and Dynamics 365 products – is still the frontrunner as a global enterprise cloud provider. Microsoft continues to develop and deploy products around artificial intelligence (AI), machine learning (ML), and Blockchain.


As the cloud market is still a new technique for many organizations, in the short term the apparent potential of the cloud might not be sufficient to make the transition to cloud computing. But when we talk about the longer term, cloud computing is increasingly appearing to be a major change in the business landscape. Also, the cost benefits of cloud computing services have started gaining acceptance in today’s economy where organizations are highly focused on addressing financial challenges.

At PixelQA, a leading software testing company, we leverage a diverse range of metrics, incorporating the latest tools and methodologies to ensure optimal results. Our QA consulting services integrate cloud and cloud computing solutions to elevate your testing capabilities. Contact us to enhance your software quality and performance

About Author

Shubham PardheShirish Tikli is an esteemed Quality Executive who commenced his professional journey in 2019 as a Software Test Engineer. He has adeptly navigated various career milestones, mastering new technologies and diverse tools and gleaning invaluable insights from past experiences.

With a forward-looking perspective, he envisions stepping into a leadership role, aspiring to become a Team Lead/QA Manager and inspire teams toward excellence in quality assurance.