The Multinomial Distribution is a generalization of the Binomial Distribution that describes the probabilities of obtaining different outcomes in experiments with more than two possible results. It is used when each trial can result in one of several categories, such as rolling a die or classifying items into multiple groups. In a multinomial experiment, each trial is independent, and the probabilities of each outcome remain constant. The distribution is defined by the number of trials and the probabilities of each category, allowing for the calculation of the likelihood of various combinations of outcomes across multiple categories.