A Section object looks like:

{
  // The unique identifier for the section.
  "id": 1,
  // The name of the section.
  "name": "Section A",
  // The sis id of the section. This field is only included if the user has
  // permission to view SIS information.
  "sis_section_id": "s34643",
  // Optional: The integration ID of the section. This field is only included if
  // the user has permission to view SIS information.
  "integration_id": "3452342345",
  // The unique identifier for the SIS import if created through SIS. This field
  // is only included if the user has permission to manage SIS information.
  "sis_import_id": 47,
  // The unique Canvas identifier for the course in which the section belongs
  "course_id": 7,
  // The unique SIS identifier for the course in which the section belongs. This
  // field is only included if the user has permission to view SIS information.
  "sis_course_id": "7",
  // the start date for the section, if applicable
  "start_at": "2012-06-01T00:00:00-06:00",
  // the end date for the section, if applicable
  "end_at": null,
  // Restrict user enrollments to the start and end dates of the section
  "restrict_enrollments_to_section_dates": null,
  // The unique identifier of the original course of a cross-listed section
  "nonxlist_course_id": null,
  // optional: the total number of active and invited students in the section
  "total_students": 13,
  // optional: A list of students that are included in the section. Returned only
  // if include[]=students. WARNING: this collection's size is capped (if there
  // are an extremely large number of users in the section (thousands) not all of
  // them will be returned). If you need to capture all the users in a section
  // with certainty or experiencing slow response consider using the paginated
  // /api/v1/sections/<section_id>/users endpoint.
  "students": null
}