Aside from the current price of Bitcoin and other cryptocurrencies, the homepage of Coinmarket includes information on marketcap, volume (24 hr), change (24 hr), and a handy 7D price graph of these patterns. The first item following the price is the marketcap, which is a way of ranking cryptocurrencies by market share, which is the current price multiplied by the number of available coins. The price itself is controlled by sometimes arbitrary-seeming forces of supply and demand. The supply is simply the amount of coins in circulation, and the max supply is the maximum amount of coins that can be in circulation. Note that some can even have unlimited amount of coins in maximum supply.