Explaining Ethereum to Grandma: What’s the Best Analogy?

Does anyone here have a really great analogy that makes Ethereum easy for a complete novice (like a grandparent) to understand?

I was able to explain Bitcoin to my grandmother by comparing it to digital gold, but I can’t come up with a simple analogy for Ethereum. I get what smart contracts are, decentralized apps, DeFi, NFTs, etc., but none of that really works when trying to explain it in elementary terms without all the industry lingo.