[HUE]

I'm trying to figure out the reason behind embedded questions. The form is clear, as a number of websites and grammar dictionaries explain the structure. It's also clear when the questions are used to report information, as in: He doesn't know when he will get here. But what about the following?

Do you know (what his job is)?
Do you remember (what his job is)?
Could you tell me...?

How do the usage of these questions differ from direct questions, as in: What is his job?

Thank you in advance for your help!