Properly citing where you find the information you use for research papers and projects is extremely important - it gives credit to those who created this information and allows for others to retrieve the same information. In addition, it helps to avoid the major issue of plagiarism: intentionally or inadvertently taking credit for someone else's work.
Since your instructors often require a bibliography or a list of works cited to be submitted along with your papers and projects, the library would like to point you towards a few resources that can help you quickly and easily create accurate citations.