How much is ERC-20 worth?

Excuse me, I'm trying to understand the value of ERC-20 tokens, but I'm still a bit hazy on the concept. Could you please elaborate on how much ERC-20 is worth? I've heard it mentioned in several financial discussions, but I'm not quite sure how to interpret its value. Is it based on market demand and supply? Or does it depend on the specific use case and functionality of the token? Could you provide some insights into its pricing mechanism and factors that might affect its worth? I'm really interested in understanding this better to make informed decisions in the cryptocurrency market.