Refined grains have been significantly modified from their natural composition, in contrast to whole grains. The modification process generally involves the mechanical removal of bran and germ, either through grinding or selective sifting.
White rice is an example of a refined grain
A whole grain is a grain of any cereal and pseudocereal that contains the endosperm, germ, and bran, in contrast to refined grains, which retain only the endosperm.
African rice in its inedible husk (seed rice, will sprout)
The same rice, dehusked (whole grain rice, colour varies by variety)
The same rice, with almost all bran and germ removed to make white rice