For any organization in any environment, the need to revise code is inevitable. The goal of DevOps is to mitigate the troubles associated with this, including downtime and last-minute failures, so end-users will not be impacted. Engineers are constantly devising new and different types of application deployment strategies to make this change effortless and error-free. 

Application Deployment Strategies Used in DevOps

Canary Deployment
Blue-Green Deployment (sometimes known as red-black)
Recreate Strategy (highlander )
Shadow Deployment
A/B testing Deployment strategy

Below, I will explain each strategy and when it is best to use them.