Collections are a way for you to organize and showcase your files in a way that is easy to work with and pleasing to look at.
Collections are personal. Your colleagues will not see them by default. Collections allow you to collect materials in a personal workspace without creating another folder in the folder structure.
You can create collections in two different ways.
Via My Collections:
In the My Collections tab, click New Collection on the left hand side of the page.
Name the collection.
Choose which template you prefer for displaying your files.
Click Create Collection.
Via The Library
Hover over a file and click Collection icon
Add the asset to your latest Collection (in this case named "Test")
Or start a new Collection and click Assign This File to a Collection.