Relativism is the concept that points of view have no absolute truth or validity within themselves, but they only have relative, subjective value according to differences in perception and consideration. As moral relativism, the term is often used in the context of moral principles, where principles and ethics are regarded as applicable in only limited context. There are many forms of relativism which vary in their degree of controversy. The term often refers to truth relativism, which is the doctrine that there are no absolute truths, i.e., that truth is always relative to some particular frame of reference, such as a language or a culture (cultural relativism).