Something granular has a grainy texture. Granular sugar is the white kind you find in sugar bowls, and a sandy beach is very granular, too.
Anything that's made of tiny bits like sand or grain can be called granular. In fact, granular comes from the Latin word granum for "grain." Granular things can also be described as coarse and gritty. A smooth, shiny floor is the opposite of granular. When you see the word granular, think “grain of sand.” Or — “grain of sugar” if that’s more your style.