VPIP, PFR, etc. What does it mean?

I play mostly B&M, some online but don't use Pokertracker or any similar program. I enjoy the analysis on this forum but don't know what these #'s all mean:

65/15/5

Can someone clarify what each % means? Is first one % flops seen? 2nd % pre-flop raise? Then seen at river?

[Mike Haven]

There are numerous abbreviations used in PT.

Perhaps the best way for anyone to learn what they mean, if they feel there is any need for them to know, is to download the free trial version?

[Tk79]

VP$IP/PFR%/AF
Voluntarily put money in pot/Preflop raise %/Post flop aggression factor

VP$IP = how often a player enters a pot voluntarily.
PFR = how often a player raises preflop
AF = bets+raises/calls post flop