Vermont Technical College’s Policy on Cheating and Plagiarism (PDF) states that "Plagiarism consists of offering as one's own work the words, ideas, or arguments of another person, without appropriate attribution."
Examples of plagiarism:
turning in someone else's work as your own, whether it's purchased from the Internet, written by a friend, or obtained elsewhere
copying words, images, or ideas from someone else without giving credit
failing to put quoted passages in quotation marks
giving incorrect information about the source of a quotation
- changing words but copying the ideas of a source without giving credit
Plagiarism can easily be avoided by citing your sources.