This is one of the oldest natural stones used for building materials; It is a form of limestone that is deposited by host mineral springs. This process of formation means it has little holes running throughout it.
These holes are either filled with a resin or cement to give a smoother appearance or left open for a more rustic, natural look.
Travertine comes in natural colours such as white, tan, cream, and rust depending on which minerals were present during formation. It can have a concentric or a veined appearance depending on how it is cut.
Travertine is soft and a porous stone so will need to be well sealed with an appropriate sealant with repetition of this process over time. It should be cleaned with an appropriate cleaner supplied by Lithofin or DryTreat.