The Independent Chip Model (ICM) is a method used to determine the value of a chip stack in a tournament. Due to the payout structure of SitNGo tournaments, chip values are not the same as real dollar values. ICM converts chip stack values real dollar values.
For more information, see the following articles:
ICM – what it is and what it does by CrunchyNuts
Using The Independent Chip Model To Improve Your Tournament Performance