How to switch deployment slot with out any downtime in app service

Deployment-slot-setting in Azure Function app #6104 deployment slot setting in azure Creating deployment slots and staging environments · Microsoft Azure · [Episode 48 deployment slot setting A deployment slot is an additional Azure App Service Web App instance which is ~bound to your production Azure App Service Web App of the

deployment slot When you deploy your web app, web app on Linux, mobile back end, or API app to Azure App Service, you can use a separate deployment slot instead of the default