The total number of Bitcoin in circulation is limited to 21 million coins. This is a result of the open source code of the cryptocurrency, which is designed to ensure that there will never be more than 21 million coins in circulation at any given time. This is a major feature of the cryptocurrency and has helped to ensure its stability and value over time.
The finite number of coins is also what makes Bitcoin so attractive as an investment vehicle. Investors know that the number of coins is limited, so they know that their investments are not at risk of being diluted by an unlimited supply of coins. This is one of the reasons why the price of Bitcoin has been so volatile over the past few years. With a limited number of coins, the demand for them drives the price up, resulting in a highly volatile market.