Cloud Computing

☁️ What is Cloud Computing?

Cloud Computing means using the internet to access computing services like:

• Servers (computing power)

• Storage (saving data)

• Databases

• Networking

• Software (apps and tools)

Instead of buying and maintaining physical servers or data centers, you rent them from cloud providers like AWS, Microsoft Azure, or Google Cloud — and pay only for what you use.

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✅ Key Features of Cloud Computing:

Feature	Explanation
On-demand self-service	Get resources (like servers, storage) anytime via internet.
Scalability	Scale up or down depending on needs (e.g., more users = more resources).
Pay-as-you-go	Pay only for the services and time you use.
Global access	Use services from anywhere in the world.
Reliability	Cloud providers ensure high uptime and backup.
Security	Built-in security, encryption, compliance.

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🔑 Types of Cloud Computing Services (Service Models):

Model	What It Means	Example Use
IaaS (Infrastructure as a Service)	Rent basic IT resources (servers, storage, network)	Host websites, run apps
PaaS (Platform as a Service)	Rent a platform to develop, run, and manage apps	Develop apps without managing servers
SaaS (Software as a Service)	Use ready-made software over the internet	Email (Gmail), Storage (Dropbox), CRM (Salesforce)

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🎯 Examples of Each Model:

Model	Example Services
IaaS	AWS EC2, Google Compute Engine, Azure VMs
PaaS	Google App Engine, Heroku, AWS Elastic Beanstalk
SaaS	Google Workspace, Microsoft 365, Dropbox

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☁️ Types of Cloud Deployment:

Type	Explanation	Example
Public Cloud	Services offered over the public internet	AWS, Azure, Google Cloud
Private Cloud	Cloud for one organization only	Corporate internal cloud
Hybrid Cloud	Mix of public and private	IBM Hybrid Cloud

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🚀 Benefits of Cloud Computing:

Benefit	Why It Matters
Cost-effective	No need for buying expensive hardware.
Scalable & Flexible	Adjust resources as needed.
Fast Deployment	Get services running quickly.
Automatic Updates	Providers handle software and security updates.
Data Backup & Recovery	High reliability, avoid data loss.
Remote Access	Access data and apps from anywhere.

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💡 Common Cloud Providers:

Provider	Key Services
Amazon Web Services (AWS)	IaaS, PaaS, SaaS — most popular & broadest.
Microsoft Azure	Cloud for businesses, strong hybrid cloud.
Google Cloud Platform (GCP)	Great for AI/ML, Big Data.
IBM Cloud	Hybrid & AI-focused cloud.
Oracle Cloud	Database and enterprise software focus.

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🌍 Real-Life Examples:

• Netflix runs on AWS to stream videos globally.

• Dropbox stores and shares files via cloud storage.

• Zoom operates on cloud for video conferencing.

• Spotify uses cloud for music streaming.

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🔑 In Simple Words:

Cloud Computing = Rent computing power and storage over the internet, pay as you go, access anywhere, and no need to worry about servers!