As far as the basic volume structure of the material is concerned, composite material have homogeneous concentration throughout the volume but FGM is something that have heterogeneous concentration from top to bottom in case of rectangular (sheet) cross section and from centre to periphery in case of cylindrical (tube) cross section.

Abu-Hussein Muhamad Composite materials are made from distinct components with uniform properties, while functionally graded materials have a continuous variation in composition and properties. Both offer unique advantages for various applications-

Composite Materials: Aerospace, automotive, construction, sports equipment

Functionally Graded Materials: Aerospace, biomedical, energy, electronics

Composite materials composed of two or more materials, we can see them distinctly

Functionally graded materials are like allow the components are mixed homogeneously, can not be seen separately