Function as a service is another popular term commonly used in a serverless architecture context. While both terms are interchangeably used, they are not the same. FaaS is the core feature of a serverless computing model. FaaS pertains to a specific function or an event, while serverless pertains to an entire stack that responds to events and functions. For instance, messaging and event streaming services, serverless storage, database, and API Gateways are involved in the serverless stack.