the.com/referral

means The act of passing someone's name on to another person or business, typically because they asked for or trust your recommendation.

from From Latin 'referre' — 're-' (back) plus 'ferre' (to carry) — meaning to carry back or relate. The word entered English through 'refer,' which first meant to direct someone's attention to something, then to hand off a matter for someone else to decide. 'Referral' as the noun for that hand-off is a relatively modern formation, gaining its business and medical sense (a patient referred to a specialist, a customer referred to a service) largely in the 20th century — the moment trust became something organizations learned to route and track.