This document provides an overview of probability through three main points: 1. It defines probability as a measure of how likely an event is to occur, determined by dividing the number of possible outcomes by the total number of possible events. 2. It explains the difference between theoretical probability, which is calculated based on a theoretical model, and experimental probability, which is determined by repeated experiments. 3. It provides examples of calculating the theoretical probability of rolling a die and determining the experimental probability of winning a game through repeated trials.