Plagiarism is defined as "an act or incident in which one uses or closely imitates the language and thinking of another author without that author's permission and represents that author's work as one's own [...]." –\sDictionary.com

As the definition above makes clear, plagiarism is fundamentally the act of passing off someone else's work as your own. This can take a number of different shapes in terms of web publishing and blogging:

Total plagiarization

This is how content scraping is defined. the most blatant instance of plagiarism and copyright violation. It indicates that people will copy entire articles and other pieces of content from other websites and publish them on their own without getting permission or giving credit.

Plagiarism in parts

Although it takes a little more work, this form is just as uncool. Partial plagiarism occurs when someone uses your content in sections (entire paragraphs, a portion of a blog post, etc.) while also adding their own words in between. Your work is still not original!

Sloppy plagiarising

Many people who use the internet engage in this sort of behaviour. It occurs when key concepts and phrases from another author creep into your work and is frequently the result of laziness, copying and pasting content from various sources, and failing to produce something wholly original.

This can happen both on purpose and accidentally.

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What plagiarism is and isn't