Wooden architecture and furniture have always had their own fame. This is mainly because of the natural look they add to your home. Having wooden furniture looks more traditional than other materials.
Wood can be used both inside and outside the house. But woods for exterior use have certain qualities that differ from the ones used inside. Non-treated timber is meant for interior use.
These can be used for structural support as well as furniture making. These are not treated with any preservatives since you are more likely to come in contact with them and these chemicals can be toxic to human health.