How many protocols are there in a router?

Excuse me, I was wondering if you could clarify something for me. When it comes to routers, I've heard about different protocols that they use to communicate with other devices on a network. So, my question is, how many protocols are typically involved in a router's operation? Are there a set number of protocols that are standard across all routers, or does it vary depending on the manufacturer or the specific type of network it's designed for? I'm just trying to get a better understanding of the inner workings of routers and how they function.