Serverless architecture represents a new stage in the app development also known as Function-as-a-Service (FaaS). It’s a kind of cloud computing changing the app building world.
Serverless is everything about freedom from “always on” server systems sitting behind an app. But initially, serverless meant a slightly different thing: the app dependence on the 3rd-party services (AWS Lambda, Autho, Parse, etc.) managing the server-side logic and state.