According to the ACPHS Academic Integrity Policy, plagiarism is "Work that gives the reader the impression that the work, words or ideas of others are the author’s own, without appropriate reference to the original source" Examples of plagiarism include, but are not limited to:
Citing your sources is an important way to avoid plagiarism.
Intentional plagiarism is what most people think of when they think of plagiarism, but the majority of cases are committed by accident.