This document establishes a vocabulary for solid biofuels, includes raw and processed material originating from forestry and arboriculture, agriculture and horticulture, and aquaculture. Materials originating from different recycling processes of end-of-life-products are outside the scope of this document, but relevant terms are included for information. This document was prepared by Technical Committee ISO/TC 238 on solid biofuels. This second edition cancels and replaces the first edition (ISO 16559:2014).