Synergy and Symbiosis

Synergy is when the same franchise, e.g. High school musical all help walt disney because they have the film, the soundtrack and the DVD game, help boost eachothers sales, it will all be inside one company.
Symbiosis is when two companies work together to share the profits for example Rovio's game angry birds will team up with a teddy bear company to make accessories for the game which will help make profits for both companies.

Here is an example of a synergy, the monsters vs aliens series was brought out on game, cd sountrack and dvd.