Carbonise is a process of treating a material with carbon or a carbon compound, usually at high temperatures. This process is used to harden and strengthen materials, as well as to improve their electrical and thermal conductivity. The term 'carbonise' is derived from the Latin word 'carbo', meaning coal or charcoal. The four-letter word CHAR is an abbreviation for charcoal, which is one of the most common materials used in the carbonisation process.