Polar duality refers to the existence of two opposite and conflicting forces or ideas, usually represented in extremes. There are several synonyms for this term, including binary opposition, antithesis, dichotomy, contrast, and polarity. In a binary opposition, two ideas are presented as mutually exclusive and are often used to highlight differences between two things or groups. Antithesis refers to the contrast between two ideas or concepts that are opposite in meaning. Dichotomy describes a situation where two ideas or concepts are sharply divided or separated. Contrast is used when there are clear differences between two ideas, things, or concepts. Finally, polarity refers to the presence of two opposite charges or ideas that are polarized or magnetically opposed to each other.