PokerTracker

That is the question, yes.
But what is the answer?

1) I don't know what PostgreSQL is.
2) Do I already have PostgreSQL, but don't know it?
3) If yes, how has having PostgreSQL changed my life?
4) If I don't have PostgreSQL, why do I need it?
5) If I don't need PostgreSQL, why would I want it?
6) How do I get/install PostgreSQL, if I don't already have it?
7) If I have PostgreSQL (and don't know it), does that still mean I want to use it with PT?
8) If a PostgreSQL is installed in the forest, but no one is there to accept the user agreement, do we hear the sound of one hand clapping?

(Yes, I've been to the PostgreSQL site.)

It's a database, and it's the database that PT3 uses, so if you want to use PT3 you'll need it.
Just download the PT3 with postgres version and it will be installed for you.

You can learn more about it on their website at PostgreSQL.org.

Best regards,

Derek