I'm wondering about the expression asking about someone's jobs.
I know and use the expression, "What do you do for a living?" when I ask somebody's job.
It's the most causal one, but I think there are various ones.

Take for example:

What are you?
What is your job?

How about those two expressions?
Are they fine when I ask about their jobs?
Is there any chance I am considered rude using "What are you?"

Please help me!
Thanks!^ ^

Question

I'm wondering about the expression asking about someone's jobs.
I know and use the expression, "What do you do for a living?" when I ask somebody's job. 
It's the most causal one, but I think there are various ones.

Take for example:

What are you? 
What is your job?

How about those two expressions?
Are they fine when I ask about their jobs? 
Is there any chance I am considered rude using "What are you?"

Please help me!
Thanks!^ ^

Answer

The most common one I hear is "What do you do?"

Answer

Who are you is better
I prefer to use;
What's your job
or
What do you do?

Answer

Do not say 'What are you?'. It may sound confusing to the person hearing it and in some cases they may find it rude.

You can ask 'What is your job?' but it sounds better if you say 'What do you work as?'

Answer

I would say "What are you?" haha But this is strongly based on context and your relationship with the other person. Don't ask someone you're just meeting this out of the blue. They may think you're asking about their ethnicity (which could be considered rude) or just be confused.

"What do you do?" is definitely a big one (as in commonly used).
"What's your job/occupation?"
"What do you do for a living/career?"