The surface is sanded flat. When this surface is oil finished the grain will be slightly raised giving slight texture, whereas lacquer will make it completely smooth to touch.
A steel brush removes the soft grain from the surface layer creating a textured surface which enhances the beauty of the natural grain. This also allows for some interesting applications of colour.
Most floors have a bevel edge on four or two sides of the surface this is usually a 1-2mm diagonal edge which helps distinguish the planks and adds character to the floor.