This document specifies the terminology to be used in the field of sustainability and greenhouse gas emission saving criteria for biomass for energy applications. This document specifically considers some relevant terms and definitions used in European Commission Directive 2018/ EU/ 2001, the recast of the Renewable Energy Directive (RED II), and the European Commission Directive 2009/ 30/ EC referred to as Fuel Quality Directive (FQD), or in other related European regulations.