Composition Reaction, also known as synthesis reaction, is when two or more chemical species combine to form a more complex product.
Synthesis reaction is the same thing as a composition reaction. This picture shows chemicals being combined and then are named a new element. This is also a chemical formula.
And this picture shows more than one chemical being combined and forming more than one new element.
Here is an example of a composition reaction, they showed what it looked like before adding sulphuric acid and after to sugar. After they added it into the sugar it became sugar charcoal.
For more information visit: http://chemistry.about.com/od/chemicalreactions/a/reactiontypes.htm
and http://www.chemicalformula.org/reactions/synthesis-reaction