It begins with some historical highlights of the understanding of combustion and technological progresses. It then discusses the thermodynamic and chemical kinetics underlying the fast chemical reactions, before expounding on the fundamental combustion wave, or flame. After this, the book moves onto the premixed turbulent flame and the spark-ignited turbulent flame, before considering the diffusion-controlled, non-premixed flame in both laminar and turbulent forms. The book concludes with explanations of wonderful natural combustion, fire, fire-retarding slime and DNA, and the amazing bombardier beetle.