According to the Council of Writing Program Administrators: In an instructional setting, plagiarism occurs when a writer deliberately uses someone else’s language, ideas, or other original (not common-knowledge) material without acknowledging its source. Council of Writing Program Administrators, Defining and Avoiding Plagiarism: The WPA Statement on Best Practices, retrieved April 10, 2018.
According to the FAMU Student Code of Conduct, "plagiarism shall include, but is not limited to,: failure of the student to use another’s work without any indication of the source and in so doing, conveying or attempting to convey that the work is the student’s own; submitting a document or assignment in whole or in part that is identical or substantially identical to a document or assignment not written by the student; allowing another person to compose or rewrite an assignment or document." Regulations of Florida A & M University, Section 2, p.6.
When you use APA, MLA, ASA or another Citation style, you avoid plagiarism by giving authors credit for their words and creative product.
Combating Plagiarism: a Hands-On Guide for Librarians, Teachers, and Students by 
The College Student's Guide to Research Papers by 
Using Sources Effectively-4th Ed by 
Plagiarism : why it happens, how to prevent it
The Complete Guide to Referencing and Avoiding Plagarism
What Every Student Should Know about Avoiding Plagiarism