Yes there are bots out there. Using them violate the TOS at ALL poker sites
. They are considered cheating. And poker sites have security measures in place to detect their play. Most of them are buggy and don't really work that great from what I understand. The simple basic premise is that they play poker for you. Either as coded or by configuration that you get to set. But they are far from intelligent and easily spotted by card rooms.
Anyway, yes, they do in fact exist.