This operation makes the diffenrence between the objects of two vector layers.
The new layer geometries is the result of the spatial DIFFERENCE of all objects from an input layer with another layer objects.
The new layer attributes are composed at least by an ID, and a GEOMETRY. Besides that, the input layer attributes can be chosen to compose the new layer.
It is accessed through:
Processing > Vector Processing > Difference...
The Difference result can be stored in different TerraLib data sources. Check data source selector for more details on how to select a data source.