A "yes/no" bet, often referred to as a binary bet, involves wagering on a straightforward outcome with two possible results—typically whether an event will occur or not. In this type of bet, the bettor chooses 'yes' if they believe the event will happen or 'no' if they think it will not. This form of betting is commonly seen in sports and political events, where the bettor is essentially predicting the occurrence of specific conditions, making the decision clear-cut and based on a simple affirmation or negation of the event in question.