What is a Referrer Policy and why is it needed?

Question

HTTP headers

1. What is a Referrer Policy and why is it needed?
2. What value should be set in the Referrer Policy if you have an advertising company?

Answer 1

1) https by default does not pass the referrer, which spoils the raspberry for many - from advertising to authentication, XSS, and so on. Therefore, they came up with the idea of ​​transmitting through a different header
2) strict-origin , just origin will give the browser swearing at non-standards