In your on-demand collections of videos, tags act as filters. They allow your customers to sort by tags. Ex. Only display videos tagged with 'Vinyasa' or 'Cooking.'
To create a tag for a video collection click On-Demand > Video Library > click on a collection > click Edit Details, scroll to the bottom and Add New Tag.
Name it, choose what it can be used for, click Save, then preview the tag by clicking the Collection Link up top. This is what the customer will see.