Materials are needed to craft items. For this you will need to gather raw materials and refine them. The more rare a raw material is, the longer it will take to refine it.
Each gatherer profession can gather 3 different raw materials and each refiner profession 3 different refined materials, each having its own rarity (common, uncommon and rare).
In the coming expansions / updates we will add more materials, even more rarities and they will also be needed for building your very own buildings.
Down below you can check all the raw / refined materials, which professions are needed to gather / refine them and some example recipes for the refining process.
Refined by Carpenter
Refined by Blacksmith
Refined by Tiffany
Blacksmith profession needed
3x Copper Ore
1x Copper Bar
Carpenter profession needed
1x Teak Wood
Tailor profession needed
*All formulas and recipes can be found here