Dualism (from the Latin word duo meaning "two") denotes a state of two parts. The term 'dualism' was originally coined to denote co-eternal binary opposition, a meaning that is preserved in metaphysical and philosophical duality discourse but has been diluted in general or common usages. Dualism can refer to moral dualism, (e.g. the conflict between good and evil), mind-body or mind-matter dualism (e.g. Cartesian Dualism) or physical dualism (e.g. the Chinese Yin and Yang). Dualism holds to the belief that there are two elements of existence: Physical and Spiritual.
Read more about Dualism: Moral Dualism, Duotheism, Bitheism, Ditheism, As A Feature of Reality, Consciousness–matter Dualism, In Philosophy of Science, In Physics, Dualism in Recent Religious Movements, Dualism in Modern and Contemporary Philosophy, Political Dualism