g.co - The official Short URL for Google website

Whenever you see a short “<a href="https://g.co/" target="_blank" rel="noopener noreferrer">g.co</a>” link, you can trust that it will always take you to a Google product or service.

One often can’t tell what website he/she is going to be redirected to. Google will only use g.co to send you to webpages that are owned by Google.