Context Views are Views inside Entity. This is very powerful concept, since you can quickly filter information by any entity. For example, you may see Products in left menu and create Roadmap View that will filter features by Product automatically.
How to create Context Views that filter data automatically?
Let's add a view that shows a list of User Stories for a Feature. Click + button near entity and select Table View:
Then select User Story as a Type and set view visibility.
Now you have a Table that shows User Story for the current feature. No need to re-create this View for every Feature, it is there automatically:
What's the difference between usual View and Context View?
The whole pattern is this:
App level contains Views that relate to the whole App
Context View contains Views relevant for this exact Entity
This approach mixes flexibility with a good structure. In some App you may be happy with just App level, while in another App you may use both. For example, it may be very useful to see Documents and Views related to exact Project or exact Team.