The short answer is:
It comes in many forms. Here are some of the more common ones:
Northeast State Community College has an Academic Misconduct policy in the Student Handbook that addresses plagiarism. Plagiarism is defined in the handbook as "the adoption or reproduction of ideas, words, statements, images, or works of another person as one’s own without proper attribution."
Sometimes plagiarism is unintentional or accidental. However, this is not an excuse - plagiarism is unacceptable no matter the reason.
Below are some links to sites that will help you learn to avoid inadvertent plagiarism.
Plagiarism does not cease to be an issue when you are out of school. Learning correct information usage and ethics now will help keep you out of trouble in the future.
The links below demonstrate people in hot water over plagiarism.