Section 2(1)(p) in The Aadhaar (Authentication) Regulations, 2016
(p)"Yes/No authentication facility" means a type of authentication facility in which the identity information and Aadhaar number securely submitted with the consent of the Aadhaar number holder through a requesting entity, is then matched against the data available in the CIDR, and the Authority responds with a digitally signed response containing "Yes" or "No", along with other technical details related to the authentication transaction, but no identity information.