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Why AWS Cloud?

Introduction​

Before learning AWS (Amazon Web Services), it is important to first understand the concept of Cloud Computing. AWS is one of the leading platforms that provides cloud services, but it is built on the broader foundation of cloud computing principles.

This section explains what cloud computing is, why it was introduced, and how AWS fits into the cloud ecosystem.

What is Cloud Computing?

Cloud computing is a technology model that allows organizations and developers to access computing resources over the internet on demand, instead of maintaining physical infrastructure in their own data centers.

Traditionally, companies used on-premise infrastructure, where they had to purchase, install, and maintain their own servers, storage systems, networking equipment, and data centers.

However, on-premise infrastructure has several limitations:

  • High capital expenditure (CapEx) for hardware purchase
  • Complex maintenance and operational overhead
  • Limited scalability
  • Long procurement and provisioning time
  • Requirement for dedicated infrastructure teams

To overcome these challenges, cloud computing was introduced.

Cloud computing allows organizations to consume IT infrastructure as services, eliminating the need to manage physical hardware.

Cloud Computing Service Model

In cloud computing, resources are provided as services, allowing users to provision and consume them whenever needed.

Some common service categories include:

  • Infrastructure as a Service (IaaS)
    Virtual machines, compute power, networking resources.

  • Storage as a Service
    Object storage, block storage, file storage systems.

  • Database as a Service (DBaaS)
    Managed relational and NoSQL database platforms.

  • Identity and Access Management as a Service (IAM)
    Authentication, authorization, and access control.

  • Network as a Service (NaaS)
    Virtual networks, load balancers, gateways, routing services.

These services are delivered on-demand, meaning developers and organizations can create or remove resources whenever required.

This model provides:

  • High scalability
  • Faster infrastructure provisioning
  • Pay-as-you-use pricing
  • Reduced operational overhead

Types of Cloud Deployment Models

Cloud computing environments are generally categorized into three deployment models.

1. Public Cloud​

A public cloud is a cloud environment where infrastructure and services are provided over the internet and are available to anyone who creates an account.

Users can provision resources such as virtual machines, storage, databases, and networking components on demand.

Popular public cloud providers include:

  • Amazon Web Services (AWS)
  • Microsoft Azure
  • Google Cloud Platform (GCP)

Public cloud characteristics:

  • Shared infrastructure
  • Internet-accessible services
  • Pay-as-you-go pricing
  • Highly scalable architecture

2. Private Cloud​

A private cloud is a cloud environment that is dedicated to a single organization.

The infrastructure is not shared with other users and is typically hosted either:

  • In the company’s own data center, or
  • In a dedicated hosting environment

Private cloud characteristics:

  • Fully controlled by the organization
  • Higher security and compliance control
  • Limited external access
  • Requires internal infrastructure management

3. Hybrid Cloud​

A hybrid cloud combines both private cloud and public cloud environments.

Organizations may run sensitive workloads in their private cloud while using public cloud services for scalable or external-facing applications.

Example scenario:

  • Internal applications run in a private data center
  • Web applications run in AWS or Azure
  • Secure connectivity between both environments

This architecture allows organizations to benefit from:

  • Flexibility
  • Scalability
  • Cost optimization
  • Controlled security environments

Where AWS Fits in Cloud Computing

Amazon Web Services (AWS) is a public cloud provider.

AWS provides a wide range of cloud services that allow developers and organizations to build, deploy, and manage applications without maintaining physical infrastructure.

AWS offers services across multiple domains, including:

  • Compute (EC2, Lambda)
  • Storage (S3, EBS)
  • Databases (RDS, DynamoDB)
  • Networking (VPC, Load Balancers)
  • Security and Identity (IAM)
  • DevOps and Automation tools

Developers can create infrastructure on demand, scale applications automatically, and pay only for the resources they consume.