Serverless refers to a deployment model in which users are responsible for only their application code and configuration. Customers of serverless do not have to bother about the underlying platform and infrastructure and can concentrate on solving their business problems by writing code against them.
Serverless does not mean there are no servers. Code and configuration needs some server to run them. Serverless is from the customer's perspective. From the customer perspective, serverless means that they do not see the server at all. They do not care about the underlying platform and infrastructure. They do not need to manage and monitor them. Serverless provides an environment that can scale up and down, out and in, automatically, without the customers even knowing about it. All operations related to platforms and infrastructures happen behind the scenes, transparently...
