Bitcoin is just the name of the cryptocurrency, and you aren't limited to just buying it in increments of 1 full Bitcoin.
The cryptocurrency can be split in to Satoshis which are worth 100/1,000,00 of a Bitcoin, or 0.0001 BTC.
An easy way to think of this is similar to dollars and cents, the Canadian dollar is equal to 1 CAD and a Canadian penny or one cent is worth 0.01 CAD. If the value of 1 BTC is equal to $25,000 CAD then 1 Satoshi would be equal to $25,000 X 0.0001, or $2.5 CAD
As the value of Bitcoin has increased drastically since its launch, transactions have moved from needing multiple Bitcoin per transaction to needing only a few Satoshis.
Also, for investing in Bitcoin, it is very convenient to not have to buy a full Bitcoin if you are only a casual investor or are risk averse.
Interestingly, the Satoshi is named after the founder of Bitcoin - Satoshi Nakamoto.
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