This lecture introduces the fundamental concepts of probability theory and measure theory, covering topics such as events, probability axioms, joint probabilities, conditional probabilities, Bayes' formula, random variables, autocorrelation functions, characteristic functions, the central limit theorem, and the binomial distribution. The instructor explains how these concepts are applied in various scenarios, such as developing tests for rare diseases and predicting the distribution of independent variables. The lecture emphasizes the importance of understanding probability and measure theory in analyzing and interpreting data in different fields.