Wood floorings manufactured from solid wood are made out of a single timber piece and comes in various thicknesses.
Semi-solid/Engineered Wood Flooring
Engineered Flooring is several layers of wood put together to form one; more often it consists of three layers glued together. The top layer is the real wood with thickness 3 - 4mm.
Laminate Flooring
It is just a high quality photographed image of wood, glued to a HDF surface giving you the look and feel of wood flooring.