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CD provides seamless migration of the existing version to the new version of the application. Some of the most popular techniques to achieve through CD are:
In-place deployment: Update application in a current server.
Rolling deployment: Gradually roll out the new version in the existing fleet of servers.
Blue-green deployment: Gradually replace the existing server with the new server.
Red-black deployment: Instant cutover to the new server from the existing server.
Immutable deployment: Stand up a new set of servers altogether.
