If a casino is Provably Fair, it means that it is using a special code to let the players or the users know that there is nothing fishy that is happening behind it. The result of every bet is created in a random manner, and hashed in a way so that nobody knows what it is.
Provably Fair Gaming means you can verify each played to ensure you always get a fair deal. This is a new technology that let's you gamble with peace of mind without actually having to take the trouble of playing in a real casino. All you have to do is to play your favorite games with the provably fair bitcoin casino.