Propositional Logic is a branch of logic that deals with propositions, which are statements that can either be true or false. It uses logical connectives such as AND, OR, and NOT to form complex expressions from simple propositions, allowing for the analysis of logical relationships and reasoning. In Propositional Logic, the truth values of propositions can be combined to evaluate the truth of more complex statements. This system is foundational in various fields, including computer science, mathematics, and philosophy, as it provides a framework for understanding logical reasoning and argumentation.