To plagiarize is to use someone else's work, whether published or unpublished, thru direct quotation or paraphrase, without giving credit to the author. Copy-pasting directly from the Internet or from online works is also plagiarism
Familiarize yourself with the Wilkes University statement on plagiarism.
And remember that your professors have access to software that detect plagiarism!
This page from Purdue University should help you avoid plagiarism:
Quoting, paraphrasing and summarizing
And several more pages from Purdue University to hone your skills at paraphrasing:
The Goblin Threat game was created by Mary Broussard with assistance on question writing from Jessica Urich.
