How would you describe your product to a 5-year-old, a student, and an expert in your field?

Lately, I'm doing a lot of writing about my product (launching this week on Product Hunt: https://www.producthunt.com/upcoming/ovice) and I'm wondering how to explain it in different levels of complexity. How would you, fellow makers, go about explaining your project to a 5-year-old, a high school student, and an expert? I'd love to read your ideas.