"What do you do for a living?" is a question that asks about someones job or profession. It is a common way to start a conversation and get to know someone better. The phrase "do for a living" is related to other phrases like "earn a living" and "make a living," which both mean to earn enough money to live normally. When someone asks "What do you do for a living?" they are asking about how the person earns their money and what their job is. It is important to have a strong answer to this question, especially in a job interview, and there are many resources available to help prepare for it.