Understanding of Cloud Computing

Benefits of Cloud Computing

High Availablity:
- Highly available systems are designed to operate continuously without failure for a long time. These systems avoid loss of service by reducing or managing failures.
Elastisity:
- With elasticity, you don't have to plan ahead of time how much capacity you need. You can provision only what you need, and then grow and shrink based on demand.
Agility:
- The cloud gives you increased agility. All the services you have access to help you innovate faster, giving you speed to market.
Durability:
- Durability is all about long-term data protection. This means your data will remain intact without corruption.

Capital Expenditures(CapEx):Capital expenditures are upfront purchases toward fixed assets.
Operating expenses(OpEx): Operating expenses are funds used to run day-to-day operations.

Infastructure as a Service(IaaS)
- Building Blocks: Fundamental building blocks that can be rented.
- Web Hosting: Monthly subscription to have a hosting company serve your website.
Software as a Service(SaaS):
- Complete Application: Using a complete application,on demand, that someone offers to users.
- Email Provider: Your personal email that you access through a web browser is SaaS.
Platform as a Service(PaaS):
- Used by Developers: Develop software using web-based tools without worrying about the underlying infrastructure.
- Storefront Website: Tools provided to build a storefront application that runs on another company’s server.

Private Cloud:
- Also called "on-premises"
- Exists in your internal data center
- Doesn't offer the advantages of cloud computing
Public Cloud:
- Offered by AWS
- You aren't responsible for the physical hardware
- Provides all the advantages of cloud computing
Hybird Cloud:
- Sample architecture for a hybrid solution
- Highly sensitive data stored locally
- Web application runs on AWS infrastructure
- AWS provides tools so they talk to each other