A Beginner-friendly tech topic
Cloud computing is the on-demand delivery of computing resources—such as servers, storage, databases, networking, software, and analytics—over the Internet (the "cloud") on a pay-as-you-go basis.
Instead of buying, owning, and maintaining physical data centers
and servers yourself, you rent these resources from a third-party cloud service
provider (like Amazon Web Services, Microsoft Azure, or Google Cloud). This model offers faster
innovation, flexible resources, and economies of scale.
Key Benefits of
Cloud Computing
Cloud computing fundamentally shifts the way businesses and
individuals manage technology:
Cost-Effective: You eliminate the high Capital
Expenditure (CAPEX) of buying hardware and setting up data centers and
switch to Operational Expenditure (OPEX), where you only pay for the
computing resources you actually use.
Scalability: Resources can be scaled up (to
handle a traffic spike) or down (to save money during slow periods) almost
instantly and automatically, without the need for manual hardware upgrades.
Global
Access:
Users can access the services and data from anywhere in the world with an
internet connection, promoting remote work and global collaboration.
Reliability
& Security: Major cloud providers
invest heavily in global networks, redundant data centers, and top-tier
security experts, often exceeding what a single company can afford to implement
on its own.
Cloud Service
Models (The "As-a-Service" Stack)
The three main service models define what the user manages versus
what the cloud provider manages.
|
Model |
What is it? |
Example |
Who Manages It? |
|
1. Software as a Service
(SaaS) |
Delivers a complete
application over the internet, managed entirely by the provider. |
Google Workspace (Gmail,
Docs), Salesforce, Microsoft Office 365, Netflix. |
Provider manages everything. |
|
2. Platform as a Service
(PaaS) |
Provides a development and
deployment environment (OS, database, web servers) so developers can focus
only on their code. |
Google App Engine, AWS
Elastic Beanstalk. |
User manages the application and data; Provider manages the
infrastructure and OS. |
|
3. Infrastructure as a
Service (IaaS) |
Provides the basic building
blocks: servers (virtual machines), storage, and networking. You rent the IT
hardware. |
AWS EC2, Google Compute
Engine, Microsoft Azure Virtual Machines. |
User manages the operating system, applications, and data; Provider
manages the hardware and virtualization. |
Cloud Deployment
Models
These models define where the cloud infrastructure is located and
who controls it.
Public
Cloud:
Services are owned and operated by a third-party provider and offered over the
public internet. Resources are shared among multiple
organizations (multitenancy).
Private
Cloud:
Cloud resources used exclusively by a single organization. It can be physically located on
the company's premises or hosted by a third party. Offers greater control and security.
Hybrid
Cloud:
Combines a public cloud and a private cloud, allowing data and applications to
be shared between them. This offers flexibility to run sensitive data
in a private environment while leveraging the scalability of the public cloud.
