While people often talk about "one Bitcoin," the network actually operates in much smaller units called (or "sats"), named after Bitcoin's pseudonymous creator.

Buying "pieces" of Bitcoin—officially known as —is not only possible but is the primary way most people start investing. Because Bitcoin is designed to be highly divisible, you don't need thousands of dollars to get started; you can often begin with as little as $1 to $10 . 1. The Smallest Unit: Satoshis

Understanding Satoshis: Bitcoin's Smallest Unit and Its Value