If you were offered this position, when could you start?

The interviewer asks when you could start the job to gauge your availability and readiness to begin working. It's important to be honest about any prior commitments or notice periods you may need to give at your current job. If you can start right away, it's okay to express that as well. Ultimately, the interviewer wants to ensure that you're able to start working as soon as possible and that there won't be any delays in getting you onboarded.

However, it is considerate to give your employer at least two weeks' notice if you are currently working. That shows the interviewer that you are respectful of your current employer. If you are not presently working, tell the interviewer you are available immediately. That shows you are enthusiastic to start working for their organization.