Research: Contains original research and authors credentials and work institutions are usually noted. The article usually has headers for Abstract, Introduction, Methods, Results, Discussion, Acknowledgements, References, and may also include graphs, charts and pictures.
Review: Examines others’ research/writing. Will share methods of obtaining information reviewed, criteria used to discern analysis, and will attempt to draw broader conclusions or identify trends.
Informational/Opinion: Usually pertain to the workings of a profession, but are not scholarly.
There is plenty of information online you may use as background information to further your knowledge, but you want to use sound science for your research needs.
Remember to evaluate: Journal, level of evidence, references used in the articles you choose.
Plagiarism is defined by the University of the Incarnate Word as the "appropriation of another’s work and the unacknowledged incorporation of that work in one’s own written work offered for credit."
If you have any questions about incorporating someone else's work into your paper, check the style manuals for guidelines or see your instructor.