Well, as simply as I can describe it, an ablation is a procedure where a catheter is inserted though a peripheral vein into the heart in order to kill cells thought responsible for conveying the errant pacing signals. There are two types, radio frequency,(RF) and cryo (freezing). Usually it starts by isolating the pulmonary veins but can treat other problem areas too. I am having my first one later this week. If you are serious you should do some real research beyond this chat room. I have recommended the book, "The AFIB Cure" by two prominent EP's before and I still think it is a good place to start. Good Luck.