😂 we need relays!

This made me think. What is the definition of a relay?

First time I heard that word was when

I discovered nostr:npub1sqzr42dj8vx32yd5jcvvl3ytux45kl0etgf6y2ymjvmd7lqmuwmqk9vk7v

And then like 6 months later I needed to use Relays to use #nostr.

But to this day I have no clue what that word even means