Serverless is a cloud service model that allows you to run code without administering the underlying servers. It takes all the workload of the infrastructure, scaling, and maintenance off your hands. Your bills are directly proportional to the compute time spent running your code.
For example:
You write a function (e.g., AWS Lambda) to process data or respond to user requests. The cloud provider automatically executes it when invoked, scales resources appropriately, and turns them off when idle.
It reduces the deployment complexity, cuts costs, and focuses more on the application logic than its infrastructure.