It is a method used to demonstrate to your readers that you have conducted a thorough and appropriate literature search, and reading. To accurately acknowledge other people's work and ideas when you are writing your own work, you need to use a citation style. With all citation styles, there are two parts you need to do: citing and the citation list (bibliography).
Accurate citation is commensurate with good academic practice and enhances the presentation of your work: it shows that your writing is based on knowledge and informed by appropriate academic reading. You will ensure that anyone reading your work can trace the sources you have used in the development of your work, and give you credit for your research efforts and quality. If you do not acknowledge another writer's work or ideas, you could be accused of plagiarism.
When you begin your research for any piece of work, it is important that you record the details of all the information you find. You will need these details to provide accurate Citations, and to enable you to locate the information again at a later date, should it be necessary to do so. Citation management (or bibliographic) software allows you to manage all the Citations you need for your papers, reports, essays or thesis by enabling you to keep them in your own personal database or library. It allows you to:
•search easily for a particular citation to which you need to refer back
•print or save a list of citations
•insert citations into your document and automatically produce a bibliography in whatever style you require.