To avoid plagiarism, you must give credit whenever you use
There are three ways of incorporating other writers’ work into your own writing.
Quotation: using someone's words. When you quote, place the passage you are using in quotation marks, and document the source according to a standard documentation style.
Paraphrase: using someone's ideas, but putting them in your own words. Although you use your own words to paraphrase, you must still acknowledge the source of the information.
Summary: should be shorter than the original passage. The summary should keep the author's original message in mind. Make sure your summary does not change the intent of the piece.