The Jobs To Be Done framework is a way to think about product development. It focuses on the customer and precisely what they are trying to achieve. The oft-cited example is that when a customer says, "I want a drill," what they really need is a well-drilled hole.
This shift in how to think about a product can be used to prioritize tasks effectively. Additionally, it helps developers understand what their users want, and therefore creates a more engaging experience.
In the context of a DAP, by knowing what a user wants to achieve, guiding software can take a more holistic view to help users complete their tasks within the application. This joined-up thinking is preferable to just explaining features individually.