In short: Sats are Bitcoin. A bitcoin consists of 100,000,000 sats like the euro consists of 100 cents. Sats is also short for Satoshi – the pseudonymous founder of Bitcoin. (Craig Wright is a fraud)
If bitcoin were distributed evenly among all 8 billion people on earth, each person would receive roughly 250,000 sats. As of the beginning of 2024, this corresponds to an equivalent value of approx. €120.00.