Quick AnswerAPA is an author-date style widely used in psychology, education and the social sciences. You cite author and year in the text and list full references alphabetically. The current version is APA 7th edition, which simplified several earlier rules.
If you study psychology, education, nursing or the social sciences, you will likely use APA. It is similar to Harvard but with its own punctuation and formatting rules. This guide covers the APA 7th edition essentials.