UIDAI introduce a new feature of lock/ unlock biometric details of Aadhaar card. It means that if we lock the biometric details, no one can access our details by Aadhaar number until we unlock it.
For enabling this feature
Step 1 : logon to https://uidai.gov.in
Step 2: click Lock or unlock biometrics https://resident.uidai.gov.in/biometric-lock
Step 3 : Enter Aadhaar number
Step 4 : Enter security code given below
Step 5 : press OTP button
Step 6 : Enter the OTP received in the registered mobile number
Now you can see the options to lock or unlock details.
Note: Once you lock your biometrics, you should not used it any institutions such as Bank, Mobile sim varification center etc.