Another thing to consider is the total supply of a coin because that represents the maximum amount of coins that can be mined or enter the market, while circulating supply represents the current amount of coins in the market. Since most coins are mined, or a percentage of them are held by the founders, there is usually a difference between the two figures.
These figures become important when evaluating the value of a crypto project. Due to the basic principle of supply and demand, the supply of coins has a large influence on the price of the coin.