Enable connectivity to services (AWS managed, endpoint services, AWS matketplace) in private networks as if they are running in your own VPC.
Interface endpoint is a collection (1+) of elastic network interfaces with a private IP address. It serves as an entry point for traffic to a service.
AWS PrivateLink used under the hood.
Attached on the subnet level(?)
Actors
Consumer creates and interface endpoint to use a service of a service provider.
Pricing
https://aws.amazon.com/privatelink/pricing/ Cost ~7.2/month) per AZ + ~$0.004-0.01/GB.