Hi there Ivy if I understand your question correctly you're asking about the difference between paraphrasing and a quotation right?
quotation: The primary device indicating that words are being mentioned rather than used.
paraphrase: A restatement of a text or passage in another form or other words, often to clarify meaning.
Plagiarism often starts with the notetaking stage of the research process. If possible, have a clear question in mind before heading off to the library so you will not waste time taking extraneous notes. When taking notes, be sure to distinguish between paraphrases and direct quotations. When you are copying a direct quotation, be extremely precise. Note all the information you will need for the citation and copy the quotation exactly as it appears. Some writers use only direct quotations while notetaking so there is no confusion as to whether a note is a paraphrase or a direct quotation. Other writers color-code notes: one color for paraphrases, another for quotations. To ensure that you are not copying wording or sentence structure when paraphrasing, you might find it helpful to put the source material aside. In summary, be consistent and conscious of whatever notetaking method you decide on. :)