Stanly! I have had this conversation countless times and tried explaining several different ways.
The secret I have found: Words are hard, pictures are easier.

I have 3 links to share that will make this very easy for you.

Simple explanations with awesome illustrations, super fun & easy: https://www.upfolio.com/ultimate-bitcoin-guide

More in-depth explanation with extra details: https://www.coindesk.com/information/what-is-bitcoin/

Nerd status if they level up and want to go deeeeeeper: https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-what-is-it

Good luck! I think explaining bitcoin is a fun challenge! Have fun with it =)

A very intuitive example. I am very interested in it. This knowledge is very useful to me.
thank you for share.