We all recommend or speak highly of a product when we have a good experience. Consider this:
You go to a “restaurant” where you’re well treated, the food is good, and the price is fair. You’re satisfied, so what do you do?
You recommend the “restaurant” to at least one friend.
Your friend goes to the “restaurant” you recommended and also has a good experience.
Your friend, in turn, recommends the same “restaurant” to his neighbor.
Obviously, that neighbor also ends up going to the “restaurant” and recommends it to his family, and so it continues.
In summary, your recommendation led to at least 2 new customers for the “restaurant.”