However, it's often used as a casual greeting, similar to "how are you?" in English.
Here are some ways to respond:
Formal:
* Bien, merci. Et vous? (Good, thank you. And you?)
* Je vais bien, merci. Et vous? (I am well, thank you. And you?)
Informal:
* Bien, et toi? (Good, and you?)
* Ça va, et toi? (I'm doing okay, and you?)
* Pas mal, et toi? (Not bad, and you?)
* Je vais bien, merci. Et toi? (I am well, thank you. And you?)
* Super, et toi? (Great, and you?)
You can also give a brief explanation of what you're doing or where you're going:
* Je vais au travail. (I'm going to work.)
* Je vais à la boulangerie. (I'm going to the bakery.)
* Je vais chez moi. (I'm going home.)
Remember, the best way to respond is to choose an answer that feels comfortable and natural for you.