When it comes to job interviews, we often see it as a one-way street, with the interviewer holding all the cards. In reality, though, it’s a two-way interaction. You are also interviewing them to see if their company is the right fit for you. Sure, sometimes desperation means you don’t have that luxury, but hopefully at some point you’ll have options and you’ll get to choose the company that’s best for you. A large part of determining that is the questions you ask at the end of the interview.
Beyond that, asking questions shows your interest in the job and the company.