Avoids Plagiarism
Plagiarism is using another person’s ideas, processes, results, text, or illustrations/clinical photographs, etc. without their acknowledgment. There are academic consequences if you use someone else's work, or even small parts of it, without citing the source and giving the author credit for their work.
Shows That You've Done Your Research
Citing your sources shows that you've done your research and are not making things up. It helps illustrate that your research is building off the research that has come before it. When you cite your sources, it helps build your credibility as a scholar.
Leads Back to the Original Source
Citations are very helpful in allowing others to find the original source. When citations are incomplete or done incorrectly, it can be difficult or impossible to locate the resource.