serverless

Serverless is a way to build software that doesn't require you to manage a server (a machine that stores and runs the software). Instead, you can just write the software, and then have a service like Amazon Web Services take care of running it for you. That means that you don't have to worry about buying a server, setting it up, and making sure that it's always running - Amazon takes care of that for you. That's why it's called "serverless": because you don't need a server.