Demystifying Cloud Computing: Exploring the Core Pillars of Private and Public Clouds, IaaS, PaaS, and SaaS
Tags: cloud, aws, devops, opensource
Published: 2023-12-02 18:18:24

## The fundamental pillars of cloud computing include various deployment models and service models. Let's explore each of these pillars:

**1. Private Cloud:**


![Private Cloud](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/2ato2bd6vjsfmf6i537m.png)

- A private cloud is a cloud environment exclusively used by a single organization.
- It is typically hosted on the organization's own infrastructure or in a dedicated environment provided by a cloud service provider.
- Private clouds offer enhanced security and control, making them suitable for organizations with strict data privacy and compliance requirements.

**2. Public Cloud:**


![Public Cloud](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/c0qkxgjg0u7qwa86nxpf.png)

- A public cloud is a cloud infrastructure that is shared by multiple organizations and is owned and operated by a cloud service provider.
- It offers on-demand resources and services to the public over the internet.
- Public clouds are highly scalable, cost-effective, and suitable for a wide range of applications and workloads.

**3. Private Cloud vs. Public Cloud:**


![Private Cloud vs. Public Cloud](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/fpbe38jrikub5luotdzl.png)

- This pillar explores the differences and trade-offs between private and public clouds, helping organizations choose the right cloud deployment model for their specific needs.
- Considerations include factors like control, security, cost, scalability, and management.

**4. Brief Introduction of Infrastructure as a Service (IaaS):**

![IaaS](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/w0hbnzr23ucbkhmsiii5.png)

- IaaS is one of the three primary cloud service models and provides virtualized computing resources over the internet.
With IaaS, organizations can rent virtual machines, storage, and networking resources, allowing them to set up and manage their own infrastructure.
- Users have control over the OS and software stack installed on the virtual machines.

**5. Brief Introduction of Platform as a Service (PaaS):**

![PaaS](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/zy0qjpavhdj2l58eecoz.png)

- PaaS is a cloud service model that abstracts away the underlying infrastructure, focusing on providing a platform for developing, deploying, and managing applications.
- Developers can build and deploy applications without worrying about managing the underlying infrastructure.
- PaaS offerings often include development tools, databases, and application hosting environments.

**6. Brief Introduction of Software as a Service (SaaS):**

![SaaS](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/sxq7wi0j60ioudbn0ak9.png)

- SaaS is a cloud service model where software applications are hosted and provided to users over the internet on a subscription basis.
- Users access SaaS applications through web browsers without the need for local installation.
- Common examples of SaaS applications include email services, customer relationship management (CRM) software, and productivity tools like Google Workspace and Microsoft 365.

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