It's an expression that means to look or examine at something closely, usually as a reference to something that has many parts or small parts (referencing grains, or small specks but not actually about grains or small specks).

What does it mean to say something is granular?

The definition of granular is something made up of grains or particles, or something with a rough surface. Sugar that is made up of tiny little individual particles is an example of granular sugar. A driveway with a rough surface and different gravel particles is an example of a granular surface.

What is a granular approach?

Abstract: The ability to accurately assess the type and extent of knowledge a user possesses without having to demand that it is explicitly declared is of importance for a range of different applications.