Regardless of whether someone accidentally or intentionally plagiarizes, the consequences are often the same.

Types of Plagiarism

Copying someone's words without giving them credit
Using or repeating someone's ideas or concepts without giving them credit
Using an image in a class presentation without giving proper credit to the creator
Intentionally presenting someone else's work as your own
Failing to acknowledge the contribution of others in work produced collaboratively

Accidental plagiarism results from the disregard for or unawareness of proper scholarly procedures.

Examples:

Incorrectly citing your sources due to lack of organization in the research and writing process
Citing the wrong sources or having incomplete or inaccurate citations
Losing track of your words versus another author's

Intentional plagiarism results from claiming sole authorship of a work that you know to have been largely written by someone else.

Examples:

Poor uses of source material do not count as plagiarism; nevertheless, these are examples of poor writing and should be avoided.

Examples: