We have all heard this question in a job interview, either when interviewing for a job as the candidate or we have asked it as the interviewer. Indeed, "what's your biggest weakness?" or sometimes, "what are THREE of your biggest weaknesses?" is still one of the most commonly asked questions in job interviews. It is so common that many recruiters and hiring managers just keep asking it in the interviews without ever stopping to think of its purpose.
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.