=============================
What is IT Infrastructure ?
=============================

=> To run a software company then we need to purchase below resources

		a) machines
		b) network
		c) power
		d) storage
		e) backup
		f) security

=> The above resources are called as IT infrastructure.

=> We can maintain infrastructure in 2 ways

		a) On-Prem infrastructure		
		b) Cloud infrastructure	

==================================
What is On-Prem Infrastructure ?
==================================		

=> On-Prem means we need to purchase and we need to maintain our resources to run our business.

=> We have several challenges with On-Prem infrastructure

		1) Lot of money investement
		2) Lot of man power
		3) Scalability (increase / decrease)
		4) Availability
		5) Network issues
		6) Security issues

=> To overcome the problems of on-prem infrastructure companies are preferring Cloud Infrastructure.

===========================
What is Cloud Computing ?
===========================

=> The process of delivering IT resources over the internet on demand basis is called as Cloud Computing.

=> We have below advantages with cloud computing.

		- Pay as you go
		- Less cost
		- Scalability
		- Availability
		- Security
		- Backup

Note: Cloud computing works based on pay as you go model.

================
Cloud Providers
================

=> The companies which are providing IT infrastructure based on "pay as you go" model are called as Cloud Providers.

1) Amazon (AWS)

2) Microsoft (Azure)

3) Google (GCP)

4) Salesforce

5) Ali Baba

6) Digital Ocean

=======================
Cloud Service Models
=======================

=> We have 3 types cloud service models

	1) IAAS

	2) PAAS

	3) SAAS

=============
What is IaaS
=============

=> IAAS stands for infrastructure as a service

=> Provider will give infrastructure for us

	Ex: Machines, Network, Storage

=> As a customer we need to prepare platform to run our application

  Ex: install required softwares + setup web servers + deploy application.

  	Ex: EC2, VPC

=============
What is PaaS
=============   

=> PaaS stands for Platform as a service

=> Provider will give ready made platform to run our application directley.

=> As a customer we need to take care of only our application deployment.

	Ex: Beanstack, Lambdas ...

=================
What is SaaS
=================

=> SaaS stands for software as a service

-> Cloud Provider will give their application to run our business.

	Ex: zoom, microsoft teams,

===========
AWS Cloud  
=========== 

=> AWS stands for Amazon webservices.

=> AWS providing cloud services from 2006 onwards

=> AWS works based on Pay as you go model

=> 190+ countries using AWS cloud services to run their businesses

=> AWS having global infrastructure

		36 - Regions

		112 - Availability Zones		

===============
AWS Services
===============

=> We have 200+ Services.....

1) EC2  : To Create Virtual Machines (Hourly Billing)

2) S3 : Unlimited storage

3) RDS : Relational Database service

4) EFS : Elastic File System (shared file system)

5) IAM : Identity & Access Management

6) VPC : Virtual Private Cloud (Secured Network)

7) Elastic Beanstack : End to end web-application mgmt (PaaS)

8) Lambdas : Serverless computing

9) Route 53 : Domain Mapping (DNS)

10) ECS : Elastic Container Service

11) EKS : Elastic Kubernetes Service

12) Cloud Watch : Monitoring

13) SNS : Simple Notification Service .....