As defined by Merriam-Webster's Dictionary, to plagiarize is:
"to steal and pass off (the ideas or words of another) as one's own : use (another's production) without crediting the source : to commit literary theft : present as new and original an idea or product derived from an existing source." Source: https://www.merriam-webster.com/dictionary/plagiarize.
This video will help you understand what you need to cite and why you need to do so:
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