In practical, everyday terms, logic is the use of reason and reasonable judgment in finding truth. Whether perfect or flawed, logic is any system or process of reasoning. It is a tool for eliminating what is irrelevant or false.
Aristotle founded the discipline of formal logic, a branch of philosophy that analyzes inference (judgment not based on direct observation). Logic may be described as the study of the principles of valid inference and correct reasoning; a course of reasoning aimed at proving a truth or falsehood, or the methodical process of logical reasoning. Logic is to be differentiated from common sense (conventional wisdom), which may have components of intuition, subjectivity, or erroneous perception.
'If–then’ logic is useful in supporting personal attitudes and beliefs; in making well-informed decisions, and in the prediction or planning of desired outcomes.