Biomass gasification is a thermochemical process that converts biomass into a combustible gas mixture called syngas (synthesis gas). This gas typically consists of hydrogen (H2), carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), and nitrogen (N2). The process involves the partial oxidation of biomass at high temperatures (700-1000°C) in the presence of a gasifying agent like air, oxygen, or steam.