Function as a Service - running individual code functions in the cloud without managing servers. Like hiring a specialist to perform one specific task only when needed.
AWS Lambda is FaaS where you upload a function to resize images, and it runs automatically whenever an image is uploaded.
All are serverless Function-as-a-Service (FaaS) platforms that run event-driven code without managing servers. They scale automatically and typically bill per request and execution time, but differ in supported runtimes, event sources, networking options, and operational tooling.