Program Semantics refers to the formal study of the meaning of computer programs. It provides a framework for understanding how programs behave and what they do when executed. By defining the semantics, developers can reason about program correctness, behavior, and potential errors. There are several approaches to Program Semantics, including operational semantics, which describes how a program executes step-by-step, and denotational semantics, which maps programs to mathematical objects. These approaches help in analyzing and verifying programs, ensuring they perform as intended and meet specified requirements.