“So Claire, what do you do?”
You're talking to someone you just met at a party. You want to know what kind of job she has, so you ask this.
So Claire, what do you do?
Use this phrase when you want to start talking to a certain person at a party or social event.
At parties, people might begin by talking in a large group, but usually break into smaller groups of two or three people to talk for a while. Asking one person in the group a question that starts with "So (name),..." is a great way to begin a conversation.
"What do you do?" is a question that adults almost always ask each other when they meet.
A: Nice to meet you.
B: Nice to meet you too, Bailey. So... tell me, what do you do?
A: I'm a jazz musician.
The question means "What is your job?", but no one directly asks "What is your job?"