This is how I explain Nostr to friends and family:

NOSTR is like a Mall with ultimate freedom. There are various entrances to the mall, and you can choose your favorite.

You are you. You have your identity. You are free to express yourself and do as you please, knowing that others can do the same. Treat others the way you’d like to be treated.

With this in mind, you will soon be able to purchase and acquire goods and services from various shops.

Its an ever growing community with no mall cops involved.