Cloud computing refers to delivering computing services—servers, storage, databases, networking, software, analytics, and intelligence—over the internet (“the cloud”) to offer faster innovation, flexible resources, and economies of scale.
1.1. Cloud Service Models
IaaS (Infrastructure as a Service): Provides virtualized computing resources over the internet. Examples: Amazon Web Services (AWS), Microsoft Azure, Google Cloud Platform (GCP).
PaaS (Platform as a Service): Provides hardware and software tools over the internet, typically used for application development. Examples: Heroku, Google App Engine, Microsoft Azure App Service.
SaaS (Software as a Service): Delivers software applications over the internet, on a subscription basis. Examples: Google Workspace, Salesforce, Microsoft 365.
1.2. Cloud Deployment Models
Public Cloud: Services are delivered over the public internet and shared across organizations. Examples: AWS, Azure, GCP.
Private Cloud: Dedicated infrastructure for a single organization, offering greater control and security. Examples: VMware, OpenStack.
Hybrid Cloud: Combines public and private clouds, allowing data and applications to be shared between them. Examples: Azure Stack, AWS Outposts.
1.3. Key Features and Benefits
Scalability: Resources can be scaled up or down based on demand.
Cost Efficiency: Pay-as-you-go pricing models reduce capital expenses.
Accessibility: Access services from anywhere with an internet connection.
Disaster Recovery: Cloud providers offer robust backup and recovery options.
Automatic Updates: Providers regularly update software and infrastructure.
1.4. Popular Cloud Providers
Amazon Web Services (AWS): Offers a broad range of services including computing power, storage options, and networking.
Microsoft Azure: Provides solutions for building, testing, deploying, and managing applications and services through Microsoft-managed data centers.
Google Cloud Platform (GCP): Offers computing, storage, and application development services for business operations.