STEM stands for Science, Technology, Engineering, and Mathematics. This is a term used to group these academic disciplines. This term is commonly used when considering educational policies and curriculum choices in schools to improve competitiveness in the development of science and technology.
STEM science usually addresses two of the three main areas: the natural sciences (including biology, physics, and chemistry) and the formal sciences, of which mathematics is an example, along with logic and statistics. The third major section of science, the social sciences (including psychology, sociology, and the political sciences) are categorized separately from the other two fields and instead grouped together with the humanities and the arts to form another parallel acronym, called HASS – “Humanities, Arts and Social Sciences, or the Humanities, Arts, and Social Sciences.
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More information about STEM could be found at this wonderful Wikipedia article: https://en.wikipedia.org/wiki/Science,_technology,_engineering,_and_mathematics