• tu the informal, which takes the second-person singular verb tense, or
• vous the formal, which also doubles as the second-person plural pronoun, equivalent to "you all".
Tu is used among close friends, family, and people younger than you. Vous is used for strangers - or even acquaintances - and people older than you.
It is very important to use which level of formality to use. It can be very insulting to someone to address them incorrectly.
To learn more about tu, vous and similar words, check out the subject pronouns lesson.
A brief explanation about the use of <em>tu</em> and <em>vous</em> in the French Language: <br/> • When do you need to be formal (vous) or informal (tu)?<br/> • <em>Vous</em> shows distance and respect • <em>Tu</em> shows equality and camaraderie • Whach the video and get the answer!