Is 1000 sats the same as sats?

I'm curious about a concept related to cryptocurrency. Could you clarify something for me? I've heard the term "sats" used in reference to bitcoin, but I'm not entirely sure what it means. Specifically, I'm wondering if "1000 sats" is equivalent to just saying "sats" or if there's a fundamental difference between the two? It seems like a simple question, but I'd like to make sure I understand the terminology correctly. Thanks for your help!