...or if you like Air Transport Pilot Licence - sort of says it all really. And just to be clear, it is issued to those who have received the appropriate training, passed the appropriate examinations (the CPL exams and the more difficult, more detailed and harder ATPL exams), a flight test sequence and who have the required number of hours, some of which have to be in a multi-crew aircraft with a mass (don't you just like that word!) in excess of 5,700 Kgs.
And Sean, please ignore the knobs who use the word "passion." Flying is a business. That's what pays your salary. But it's an interesting job with a brilliant view and if you're (very) lucky a career as well. But it is highly toxic on personal life. And for a newbie, at the moment it is also exceedingly wallet damaging as well. If you REALLY have go for it (I really wouldn't) follow Redsnail's advice and ignore mine - I've got as far as I'm going to get and can see retirement looming.