Copied-and-pasted text, paraphrases, duplicate content, quotes, similar passages, etc.
With the increasing use of digital technology in research, education and knowledge sharing, new forms of plagiarism and the temptation to copy/paste are also increasing.
Plagiarism is the act of portraying someone else's work as your own. In documentary research and writing (dissertation, internship report, thesis, paper, etc.), you're allowed to use another author's ideas, provided that the reader is informed of the source for an idea, text or work.