Wood

Bark is a block that was added to the creative inventory in the 1.13 snapshot, 17w47a, and was later made craftable. Like wood, it comes in 6 different types: oak, birch, spruce, jungle, dark oak, and acacia.

Crafting
Bark can be crafted out of four matching logs, yielding three bark as a result.

Usage
Bark can be used as a decorative block in place of normal logs.

Fuel
Bark can be used as a fuel in furnaces, smelting 1.5 items per block.