Turnitin will only show your content plagiarized if you have used Turnitin to check plagiarism in your content and it has stored content in the repository or if you are copying content from any "online" resources.

Turnitin stores all submitted papers in a databank so that each new paper can be compared to all of those previously submitted ones. It also has access to the world wide interweb, through a spidery “webcrawler” or bot that basically scans the entire Internet and also stores it in an archival database for paper comparison.

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