This question is similar to the 'tell us about your greatest achievement' question. My top tips on answering this:
1. Have a clear structure. Focus on 3 action points within the STAR approach.
2. Don't explicitly state skills. Show them through the responsibilities that you have undertaken.
3. Ensure that you include quantifiable results. Avoid saying 'I conducted workshops for students.' How many workshops did you host? How many attendees were there? What was the workshop based on? What was the impact? Did you receive any positive feedback?
4. Another great way to measure success is to highlight the emotional response - did you help your team reduce stress by motivating them? did you provide a unique idea to solve a problem.
5. While discussing skills is important, try not to overdo this. I would recommend sticking to 2-3 skills at most.
6. Be clear about your role and its significance if your answer is a team-based example.