The supply of Bitcoin is limited to a total of 21 million coins. This is an important factor to consider when investing in Bitcoin, as it means there is a finite amount of the cryptocurrency.

The limit of 21 million Bitcoin is hard coded into the Bitcoin protocol, meaning that no more Bitcoin can be created. This is different to traditional fiat currencies, which can be printed in unlimited amounts at the discretion of the government.

The limited supply of Bitcoin is one of the features that makes it attractive to investors. It is seen as a way of protecting against inflation and preserving the value of the currency.