In the world of casinos, the term rating is used to refer to the process where casinos rate players in order to determine their skill level or bankroll they have at their disposal.
Usually, whenever a player enters a brick-and-mortar casino, a floorperson will come up to them and ask them if they wish to be rated. Based on your playing style, skill, as well as the amount of money you win or spend, you will receive a rating that will net complimentary rewards and, potentially, get you special treatment at the casino.
Since casinos want to have as many recurring customers as possible, that information will most likely be stored in some of the casino’s databases. Note that you can continue building up your comp points whenever you revisit the casino.