Engineered floors are made of layers of plywood and solid top that can be refinished in the future (We only install high quality materials that can be refinished). That make this kind of flooring more forgiving of changes in humidity and more stable than solid hardwood floors.
Engineered floors, can be sanded and refinished; there are whole range variety of species, grades, and finishes. The big advantage of engineered flooring is that wider planks than solid hardwood.
The installation methods are stapled down, floating, or glued down.