Documentation can relate to two different types: products and processes. Product documentation describes the product under development and provides guidelines on how to execute actions with it. Process documentation, on the other hand, relates to all the material created during development.
Product documentation tends to include requirements, technical specifications, commercial rationale, and product manuals. In contrast, process documentation includes aspects like obligatory standards, material outlining the wider project, plans, test itineraries, general reports, and even generic notes. Broadly, the difference between the two is that product documentation details an object (be it tangible or digital), and process documentation details the timeline of creation.