Some types of papers, such reviews of other written works, end with a Conclusion section. In a review-type text, your Conclusion should summarize the main points of the reviewed material, as well as the main points from your own evaluation of that material. Your Conclusion should summarize your thesis statement and main supporting points without repeating them word for word.
In longer works such as theses, it is possible for each chapter to have its own Introduction, Methods, Results, and Discussion sections. In such theses, you can use a Conclusion chapter or section to summarize the entire work. A Conclusion can also point to further topics for discussion that are related to the thesis statement, or perhaps give suggestions for future research.
In the Conclusion, you should avoid bringing up new information, nor should you repeat sentences word by word from the rest of the text. Focus instead on the overall arguments.