Plagiarism is BAD

Plagiarism is very serious. It's basically stealing someone else's idea/s and claiming them to be yours. "Plagiarism is an act of fraud." (link) Turning in someone else's work or having someone else do your work for you is plagiarism and should be avoided because it's "stealing".

To avoid plagiarism, you have to give credit where credit is due. If you "paraphrase another's spoken or written words", use "quotations of someone's spoken or written words", use "another person's idea, opinion or theory", you have to cite your source. << Source