Read this on the main serverless docs site

Serverless Infrastructure Providers

Under the hood, the serverless framework is deploying your code to a cloud provider like AWS, Microsoft Azure, Apache OpenWhisk or Google Cloud functions.

AWS Docs

Azure Functions Docs

OpenWhisk Docs

Cloud Functions Docs

Connecting your provider

To deploy functions, specify your provider in your service's serverless.yml file under the provider key and make sure your provider credentials are setup on your machine or CI/CD system.

# serverless.yml
service: my-service-name

provider:
  name: aws