Composite materials are formed when two or more materials are combined on a macroscopic scale to form a new material, this new material the by-product of the combined previous materials, will usually show their predecessors best qualities. Composite materials are of mainly four types varying in characteristics. They are Fibrous composite materials, laminated composite materials, particulate composite materials, and the last type being a combination of some or all of the first three types.

Each composite material has different mechanics because of their structure. Aluminium, titanium, and steel all have different mechanics and each of them although being a composite material has different strength-to-density and stiffness-to-density ratios making them purposeful for different purposes.
Not all composite materials show improved qualities but most of them do and some of the improved combined properties of composite materials are: