The purpose for writing a summary is to help understand and remember what is read. Summarizing involves condensing the main ideas and key details of a text into a concise and coherent form. By summarizing a text, you are able to identify the most important information and understand the overall message or main points. This can help you retain the information in your memory and make it easier to recall later on. Additionally, summarizing can also help you develop better comprehension skills and improve your ability to extract key information from a text.