Wikipedia
PokerTracker Software, LLC is the name of a poker tool software company that produces the popular PokerTracker line of poker tracking and analysis software. PokerTracker's software imports and parses the hand histories that poker sites create during online play and stores the resulting statistics/information about historical play into a local database library for self-analysis, and for in-game opponent analysis using a real-time Head-up display.
The software allows the user to monitor each poker session's profit or loss, hands played, time played, and table style. It calculates and graphs statistics such as hands per hour, winnings per hand, winnings per hour, cumulative profit and loss, and individual game profit and loss across multiple currencies.