Summarising helps the reader to see how information or events are related and to understand the content and structure of a text. The reader identifies the important information or events in a text or part of a text and remembers, retells, or records them in a shortened form, which enables the reader to make connections within the text.
In order to do this, the reader needs to have a clear idea of its structure and to be able to differentiate between important points and supporting details. To do this, the reader identifies key words, facts, events, or ideas and notes which parts of the text contain the details that go with each of them.