Logic is the study of reasoning and argumentation. It is a systematic and formal approach to understanding and evaluating the validity and soundness of arguments. Logic involves the use of principles and rules to determine whether an argument is valid or invalid, and whether the premises of an argument support its conclusion. It helps in identifying and analyzing the structure of arguments, identifying fallacies, and making logical deductions and inferences. Logic is used in various fields such as mathematics, philosophy, computer science, and linguistics to ensure clear and coherent reasoning.