Almost any job ad on any job site includes a mention about required previous experience: "The ideal candidate will have 5 years of experience in a similar role", "We are looking for someone with 3-5 years related experience", "At least 7 years of experience performing similar tasks is required", and so on.
In today's job market, changing jobs periodically is a rule rather than an exception. In fact, the rough estimate is that we change jobs 10-15 times during our professional careers. Long gone are the days when you would graduate from college, settle in a stable job, and retire decades later from the same company.
Do you have any questions for us? Anyone who has ever interviewed for a job has most likely been asked this question. The reason interviewers like to ask this question is not only because they might want to be courteous toward you by clearing your doubts. No, the real reason why most interviewers offer to answer your questions is because they want to hear what kind of questions you have.