Why add "/go" in shorter URLs?

[blackmagiccure]

Hello friends,

Why add "/go" in shorter URLs?

[BangkokDinning]

A unique short URL is created each time a long URL is shortened. Signed out. Your links won't show up on your goo.gl page. The same short URL is reused each time a long URL is shortened by you or someone else. Report an abusive goo.gl short link. Report abusive goo.gl short links by filling out a spam report.