What is a dominant strategy?

In game theory, a dominant strategy is one where regardless of what the other player does, you always have a larger payoff.

In probability a dominant strategy is the one with the higher likelihood of winning. For example, if you have 30% red M&Ms, 70% yellow M&Ms coming out of a tube, the dominant strategy will be to always guess yellow. (Probability matching, which most adults use is guessing 30% of the time red, and the rest yellow). An every day example would be two work routes- one that is 80% of the time traffic jammed, and the other which is only 10% of the time traffic jammed. You will always prefer the second route- despite the small probability that the first route is better.