AWS - Amazon Web Services

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What is cloud computing?
Cloud computing provides on-demand access to IT resources like compute, storage, and databases over the internet. Users pay only for what they use instead of owning physical infrastructure.
Cloud enables accessing technology services flexibly as needed without big upfront investments.

How many types of deployment models exist in the cloud?
There are three different types of deployment models in the cloud.
1) Private cloud: 
    - this type of service is used by a single organization and is not exposed to the public.
    - It is adapted to organizations using sensitive applications.
2) Public cloud:
    - these cloud resources are owned and operated by third-party cloud services like Amazon Web Services, Microsoft Azure, and all those mentioned in the AWS market share section.
3) Hybrid cloud:
    - this is the combination of both private and public clouds.
    - It is designed to keep some servers on-premises while extending the remaining capabilities to the cloud.
    - Hybrid cloud provides flexibility and cost-effectiveness of the public cloud.

What are the five characteristics of cloud computing?
Cloud computing is composed of five main characteristics:
1) On-demand self-service:
   - Users can provision cloud services as needed without human interaction with the service provider.
2) Broad network access:
   - Services are available over the network and accessed through standard mechanisms like mobile phones, laptops, and tablets.
3) Multi-tenacy and resource pooling:
   - Resources are pooled to serve multiple customers, with different virtual and physical resources dynamically assigned based on demand.
4) Rapid elasticity and scalability:
   - Capabilities can be elastically provisioned and scaled up or down quickly and automatically to match capacity with demand.
5) Measured service:
   - Resource usage is monitored, controlled, reported, and billed transparently based on utilization. Usage can be managed, controlled, and reported, providing transparency for the provider and consumer.

What are the main types of Cloud Computing?
There are three main types of cloud computing: IaaS, PaaS, and SaaS
1) Infrastructure as a Service (IaaS):
 Provides basic building blocks for cloud IT like compute, storage, and networking that users can access on-demand without needing to manage the underlying infrastructure. Examples: AWS EC2, S3, VPC.
2) Platform as a Service (PaaS):
 Provides a managed platform or environment for developing, deploying, and managing cloud-based apps without needing to build the underlying infrastructure. Examples: AWS Elastic Beanstalk, Heroku
3) Software as a Service (SaaS):
 Provides access to complete end-user applications running in the cloud that users can use over the internet. Users don't manage infrastructure or platforms. Examples: AWS Simple Email Service, Google Docs, Salesforce CRM.
4) Faas - Functions as a Service
5) DBaaS - Database as a Service
6) DaaS - Desktop as a Service
7) IOTaaS - IOT as a Service
8) AIaaS - AI as a Service

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