Endpoints in an OpenStack private cloud are network addresses used to access and interact with various OpenStack services such as Nova, Neutron, Cinder, Glance, Keystone, and so on. These endpoints enable users and other systems to communicate with OpenStack services in a standardized and uniform manner, regardless of the underlying technology. Endpoints are typically defined by giving a URL and port for each service, as well as any necessary authentication information, such as an API token or user credentials.