A fuel is anything that fire can and will burn.
Fuel is the combustible matter used to sustain fire.
Typically this is the most prevalent type of vegetation in a given area. A fuel model is a mathematical representation of various fuel types used in mathematical fire spread models. Simply put, fuel models are tools that help land management agencies realistically estimate fire behavior or fire danger. The FBPS divides the four vegetation types into 13 fuel models that are more simply structured. The icons below link to summaries of the four main fuel types with pictures of each.