Composite materials are made from two or more materials with significantly different physical chemical properties.
e.g. Wattle & daub, papier mache, mud bricks, mortars, concrete, cement, reinforced plastics such as fiber-reinforced polymer, Bakelite, fibreglass, plywood, carbon fibre, polyester.
Some websites you may find useful for your assignment are:-
BBC - BITESIZE - Brief information on ceramics, polymers and composites.
Polymer Science Learning Center - General information. diagrams and links.
Explain that stuff - Overview with pictures and links.
Royal Society of Engineers - Definition and examples.
Masterbuilder - Definition and information on uses and advantages of using composite materials.
Types of composite materials:-
Encyclopaedia Brittanica - History of mud bricks
Nikkiso - Major applications and properties of CFRP, plus diagrams.
Altairenlighten - Information on sandwich structures.
UNSW - Information on particle reinforced composites, diagrams and links.