What is APA style?
APA Style® is a set of rules and guidelines that help code the many components of scientific writing in a clear, uniform way to help increase reading comprehension. You can find the entire set of APA Style® rules and guidelines in the sixth edition of the Publication Manual of the American Psychological Association.
Source: https://www.apastyle.org/learn/faqs/what-is-apa-style.aspx
Who uses APA style?
A variety of disciplines utilize APA Style®, especially those within the social sciences. Be sure to check with your advisor/professor as to which writing style should be used for your specific project.
Click on the APA Styling links to the left to learn more about the specific elements, rules, and guidelines of APA Style®
(All information derived from https://owl.english.purdue.edu/owl/resource/560/01/ and http://www.apastyle.org/index.aspx)