Such as guarantees, recalls, offers, campaigns, financing, leasing, standard maintenance, buying original parts, upgrading software, downloading GPS maps, resetting the addblue, refilling your particle filter liquid, changing belts, buying extra power for some time...
I thing that the term is pretty self-explainable. Every support that the customer could request from the brand after the sale. Some of this things can be provided by anybody, other only by the brand.