Tracks 

Groups of related licenses that users can upgrade or downgrade within for example Mobile data, Voice and Software.

Think Burger Meals, Pizzas & Sushi🍔🍕🍣 - different menus, flexible choices.

Licenses 

Bundles of capabilities sold for a single price (like CC Pro, CC Omni and Mobile Flex). 

Think Happy Meal🍱 - a complete set for one simple price.

Capabilities

Individual features (like Call Recording, Software, 5G and Call Widget). 

These can be sold separately - think burger, fries & soda🍔🍟🥤.