Implied Odds

Like regular pot odds but also taking into consideration estimated future betting.

If the pot has $300 and your opponent bets $100, you are getting 4-to-1 pot odds to call (you need to call $100 in order to have a chance to win $400). However, if there are future betting rounds in which you might win even more money, that helps create even better "implied odds."

For example, if you call that bet on the flop with a straight draw, and then make your straight on either the turn or river, you might win more money, thus affecting your "implied odds" when making the initial call.