What is ERC explained simply?

Could you please break down ERC for me in a simple way? I'm not a crypto expert, but I've heard this term a lot and it seems important in the world of cryptocurrency. Is ERC related to Ethereum? And if so, how does it fit into the bigger picture of blockchain technology and finance? I'm just trying to wrap my head around the basics here. Could you explain ERC in a way that's easy to understand, without too much technical jargon?