Composites are usually formed to create new materials with enhanced physical, mechanical or working properties. For example they may be formed to create light, strong materials (good strength to weight ratio) or materials that are both shock and temperature resistant.

Many composites are made up of just two materials. One material called the matrix or binder surrounds and binds together a cluster of fibres of a much stronger material called the reinforcement. In the case of mud bricks the mud became the matrix and the straw became the reinforcement.

Tyres are good example of composite materials. Modern tyres are constructed of layers, which may include rayon cloth, steel bands and nylon belts all set in a matrix (binder) of rubber