A principle is a fundamental truth or proposition that serves as the foundation for a system of belief or behavior. It guides actions and decisions, helping individuals and organizations determine what is right or wrong. Principles can be moral, ethical, or scientific, and they often reflect core values. In various fields, such as science, philosophy, and law, principles help establish standards and frameworks. For example, the scientific method relies on principles like observation and experimentation to validate hypotheses. Similarly, ethical principles guide behavior in professions, ensuring that individuals act responsibly and with integrity.