When should I use rel=noreferrer?

Question

I have to link some other external sites.

I know when to use nofollow. But I am not clear when I should use rel=noreferrer.

Answer 1

You'll o ly need to use this on private pages or pages you dont want to advertise. E.g. a webmail or private bug tracker would be considered private and you don't want to leak any information to the external linked websites.

Sensitive public pages, like medical information or other sensitive topics may also want to mask the referrer header.