When writing an essay or assignment, you are required to acknowledge all the sources of information that you have used, whether you are directly copying the words of another author (quoting) or putting their ideas into your own words (paraphrasing). This is so you can
References have two parts:
If you do not acknowledge your information sources, then you are plagiarising their work. Plagiarism is defined as the taking, using, and passing off as your own, the ideas or words of another. It is a very serious academic offence, and may result in your work being failed automatically.