What is Q(s, a)?

Q(s, a) is like a scorecard that helps you choose the best move in a game.

Imagine you're playing a board game where you can land on different squares (s for state), and from each square, you can pick different actions (a for action), like rolling a dice or moving a piece. Q(s, a) is your scorecard that tells you how good an action is in a certain situation.

Think of it like having a cheat sheet. If you're on square 5 and decide to move forward 3 spaces (action), your scorecard might say "you get 10 points here." That number (like 10) is what Q(s, a) holds, it tells you how good that choice was.

Every time you play, you update your cheat sheet. If moving forward 3 spaces gives you more points than expected, you might change the score to "12" next time. This helps you make smarter choices in future games, just like learning from your mistakes!