A serverless compute service that runs code in response to events (HTTP, queues, timers, storage changes) without managing infrastructure. You pay only for execution.
The AZ-900 example of serverless/FaaS, equivalent to AWS Lambda. Question: how do you run code in response to an event without managing servers in Azure? Azure Functions. Pricing model: based on number of executions and execution time.
Azure Functions is a concept that can show up on the exam. Check the full guide to see it in context.