what is feature flag ? and an example in Azure DevOps services

Feature Flag : A feature flag is also known as a feature toggle, feature switch, feature flipper or conditional feature. They were popularized by Martin Fowler. Feature flags support a customer-first DevOps mindset, to enable ( expose ) and disable (hide) features in a solution, even before they are complete and ready for release.


Feature Flag Feature  in Azure DevOps   -------->  is called as Preview features.

This Preview feature has enable and disable option. ( This is from Azure DevOps Services).

Purely a customer choice whether to use the feature or not.