I agree with Daiki-san.
When I talk to a stranger, I don't need to say YOU in Japanese, however, when I talk with some unknown people, I would use ANATA for the first time, until I know their name.
We usually don't use ANATA between close people because we use their name.
When I talk with teachers or doctors, I call them (last name) + SENSEI.
When I talk with clients, people who are older than me, who aren't friends, coworkers, etc, I call them (last name) + SAN.
There are more ways to say YOU in Japanese but I think what I said is the most basic way.
I hope this was helpful.