A longer summary will indicate, in condensed form, the main points in the passage that support or explain and the emphasis given to them. It may even include some important examples from the passage. But it will not include minor details. It will not repeat points simply for the purpose of emphasis. And it will not contain any of your own opinions or conclusions.
Critical reading requires the abilities to both summarize and evaluate a presentation.
As stated a summary is a brief restatement, in your own words, of the content of a passage. An evaluation is a more difficult matter. These skills cannot be taken for granted and must be developed through repeated practice. For a couple of examples of completed versions of this assignment, please go the readings and look under Annotated Bibliographies 1 and 2.