Granite is a very hard, granular, crystalline, igneous rock.
It is formed at great depths under great pressure.
It is composed mainly of quartz, feldspar, and mica, and due to its durability is often used as a building stone.

Marble is a type of metamorphic rock, composed mainly of calcium carbonate or limestone.
It is swirled or clouded and most often used for architectural or ornamental purposes. The most common kind is white.

Engineered Stone is a man-made composite material consisting of mainly rock and resin.
It is considered to have good resistance to staining, with relatively low maintenance. It is used primaril for kitchen countertops.