Devops

3 Key Elements of a Great Software:

Enhanced communication.  
Automation.  
Quick Feedback. 

Agile

(Brings business and development teams together and immediate feedback is given at the end of each sprint)
Involves business teams and development teams   
Quick Feedback.   
Continuous Integration. 

Microservices

As they evolved Operations team had a big role to play.   
DevOps evolved.  

DevOps

Enhance communication between Development & Operations teams.  
Continuous Deployment (deploy new version of software continuously).  
Continuous Delivery (deploy software into production continuously).  

Infrastructure as Code

Continuous Development: Git, SVN, Mercurial, CVS, Jira   
Continuous Integration: Jenkins, Bamboo, Hudson    
Continuous Delivery: Nexus, Archiva, Tomcat   
Continuous Deployment: Puppet, Chef, Docker   
Continuous Monitoring: Splunk, ELK Stack, Nagios     
Continuous Testing: Selenium, Katalon Studio   

Infrastructure as code - Process:

Create Template -> Provision Server -> Install software -> Configure Software -> Deploy App    

Provisioning server can be done by AWS Cloudformation or Terraform    
Install software/Configure Software (both are configuration management) and can be done by Chef, Ansible or puppet.     
Deploy App can be done with Jenkins or Azure DevOps. 

Continous Integration

Code Commit -> Unit Test -> Code Quality -> Package -> Integration Test 

Continous Deployment

Code Commit -> Unit Test -> Code Quality -> Package -> Integration Test-> Package -> Deploy -> Automated Test 

Continous Delivery

Code Commit -> Unit Test -> Code Quality -> Package -> Integration Test-> Package -> Deploy -> Automated Test -> Test Approval -> Deploy to be next environment 

References:

https://www.udemy.com/course/devops-with-docker-kubernetes-and-azure-devops