Plagiarism is the act of defrauding someone of their ideas. It's like a planned armed robbery, only in this case you're not robbing with a gun. It's illegally collecting someone's intellectual work and passing it as yours. It's Theft
A few things to specify what plagiarism really is;
Directly coping word for word from a work done, this one is the highest of the highest. They are coming for you.
Using videos from the internet without giving credit or obtaining permission from the creator
Using images from the internet without giving credit or obtaining permission from the creator
Falling to add quotation marks to quotes
Using the particular structure of a work while changing some words without credit to the source
However, the truth is the term 'originality' is a remix of the 'old', one gathers inspiration from so much as we generally scroll through our feeds. then you ask how does one write or use a media material while being inspired by it, the answer is CITATION
What is Citation?
it's simply acknowledging someone who inspired you through their work, giving them the accolades they deserve just as you expect to be given accolades of your own for work done
Here is an example of how you can cite a text
"Be original. That's my best advice. You're going to find that there's something that you do well, and try to do it with as much originality as you can, and don't skimp on the words. Work on the words. -Bob Seger" Source
"I have read and understood the steemit Etiquette on Steemit Community and will do my best to embrace them"