> For the complete documentation index, see [llms.txt](https://sunbird.gitbook.io/sunbird-spark/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sunbird.gitbook.io/sunbird-spark/learn/components/content-collections.md).

# Content collections

Content in Spark can be organised into collections that give learners a structured, progressive learning experience.

### Collection types at a glance

|                           | **Course**                     | **Playlist**                           | **Digital textbook**                            |
| ------------------------- | ------------------------------ | -------------------------------------- | ----------------------------------------------- |
| Account required          | Yes                            | No                                     | No                                              |
| Progress tracked          | Yes                            | No                                     | No                                              |
| Certificate on completion | Yes                            | No                                     | No                                              |
| Batch management          | Yes                            | No                                     | No                                              |
| Typical use case          | Structured training programmes | Resource libraries, reference material | Curriculum-aligned content for browse-and-learn |

### Trackable collections — Courses

Courses require a learner account and track individual progress.

**They support:**

* **Batch management** — a course runs as one or more batches, each with its own enrolment window, start date, and end date. Open batches allow self-enrolment at any time; closed batches require an administrator to add learners.
* Progress tracking at both lesson and course level
* Certificate issuance when a learner completes `100%` of the course
* Assessment integration with QuML-based assessments embedded within a course

### Non-trackable collections

Playlists and digital textbooks are open access. They do not require a learner account and do not track progress.

They are suitable for reference material, resource libraries, and browse-and-learn use cases.


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