Azure App Services provides deployment slots that make deployment to them seamless and easy. There are multiple slots and swapping between slots is at DNS level. It means anything on production slot can be swapped with a staging slot by just swapping the DNS entries. This helps in deploying the custom cloud solution to staging and, after all checks and tests, they can be swapped to production if found satisfactory. However, in case of any issue in production after swapping, the previous good values from the production environment can be reinstated by swapping again.