Collections are folders of images and layers that members can curate to organise items for personal reference or for use as part of a course. Members can see an example Collection here. Subcollections can be created within Collections for further organisation. For example, one main Collection can be created for a Course and then subcollections are created to organise the images viewed for each week in the course.

Items in Collections can be arranged so that they are presented to others in a logical order, including the order in which you wish to teach the material in.

Collections make it easy to share a number of images and layers with other members. Read more about sharing Collections here.
Images and layers can be added to multiple Collections so that you can reuse the same item for many purposes.
Collections also provides access to the automatically generated folders for Annotated images and Favorite images, replacing the previous My Slides area.