A dissertation is a long, formal document that presents original research and is written as part of the requirements for a doctoral degree. It is typically a requirement for earning a Ph.D. or other doctoral degree. A dissertation is usually based on extensive research and demonstrates a candidate’s ability to contribute new knowledge to their field. It is typically organized into chapters and includes an introduction, literature review, methodology, results, and conclusion. The process of writing a dissertation is often a long and complex one, and it can take several years to complete.