A great product experience starts with a good understanding of the users. UX design team wants to know who users are, their needs, fears, motivations, & behavior.
Personas are fictional characters created to represent the different user types that might use a product in a similar way. The purpose of personas is to create reliable and realistic representations of the key audience segments for reference.
The user journey map is a that illustrates user flow within a product/service, which helps understand the product/service interactions from users' point of view.
The product architecture map shows the hierarchy and navigation structure of a product. It serves to show how the content will be organized into screens or sections and how the user may transition between them.