Staking is where a player stakes you with their money to play on a site and in a certain way for example he gives you $50 and tells you to grind out the micro $1 sit and goes and then he gives you a percentage of money i.e; 60:40 in your favour + stakeback, so at the end of the required number of games played you go back to your staker show him your graph and you give him his initial stakeback ($50) along with 40% of the profits you made. I hope this helps clear it up a bit.