Law of nature, also known as natural law or law of the universe, refers to the fundamental principles that govern the physical and moral world. These laws are considered to be unchanging and universal, and are often essential to scientific inquiry and ethical discussions. Synonyms for law of nature include natural principle, physical law, cosmic law, divine law, immutable law, universal law and ethical law. These terms often overlap in meaning, but each has its own connotations and applications. For instance, divine law is often associated with religious beliefs, while ethical law is concerned with moral principles. Regardless of the terminology used, the laws of nature continue to inspire and fascinate scientists, philosophers and theologians alike.