The market cap is a common measure of the amount of value contained within an asset. It is calculated by multiplying the value of a unit by the amount of that unit in existence. This can be used for stocks to determine the value of a company (stock price multiplied by the amount of stock in existence), or in the case of Bitcoin, the price of a single Bitcoin multiplied by the total circulating coin supply. In 2021, The market capitalization of Bitcoin reached the $1,000,000,000,000 (One Trillion) USD figure, the fastest asset to reach $1T USD in the world.