The baseboard covers the corner edge where the floor meets the wall. They are there partly for aesthetic reasons, to hide joint between the wall and floor surfaces. But they are also there to protect the lower wall, which can easily be damaged by shoes or vacuuming. A base board should choose to complement the wall and floor décor.
Baseboards, like door frames, window frames, or cornicing on the ceiling, are part of the room trim. The element of the trim should all be of the same style, and should all work with the room. High baseboards will not really suit a room with a low ceiling, but they might work well in a large hall.
Baseboards are usually made of solid timber, or perhaps MDF (medium Density Fibreboard). They are often painted to suit the walls. This might mean the same colour as the walls, or it might mean being painted white to provide a contrasting frame to the wall colour.
Alternatively, baseboards can be made to match the floor. This is more common if the floors are timber. Timber baseboards can also work on hard vinyl floors or tiled floors.
Timber and bamboo are natural products. This mean they will expand and contract with changes in humidity and temperature. To accommodate this expansion and contraction the floor will be built with a small gap around the edges. This gap will accommodate the change in floor size. Without this gap an expanding floor will be prone to buckling and warping.
The Baseboard will cover strategically placed gap around the edge of the floor. This baseboard should be attached to the wall rather than the floor, else it will not accommodate the movement in the floor
If a floating floor is put above the existing floor than the baseboards will have to be raised to accommodate the higher floor level.
Consider the baseboard options when deciding on your floor.