Deploying applications is a critical step in the release process. Various deployment strategies have been developed to ensure that software updates are rolled out efficiently and with minimal disruption. In this article, we will explore several deployment strategies, including Blue-Green Deployment, Canary Deployment, and Rolling Deployment. We'll discuss their pros and cons, compare them, and provide recommendations for when to use each strategy. Additionally, we'll touch upon the concept of rollback and share examples of situations where no deployment strategy is necessary.