Plagiarism is Turning in someone else's work as your own. Copying large pieces of text from a source without citing that source. Copying from a source but changing a few words and phrases to disguise plagiarism. Paraphrasing from a number of different sources without citing those sources.
For more information about plagiarism, follow the links below.
https://www.youtube.com/watch?v=PzZsButRaHs
https://www.elearners.com/education-resources/online-learning/how-to-avoid-plagiarism/