Synergy occurs when multiple companies collaborate across various media like film, soundtracks, and video games to promote a product and increase profits. For example, Disney Pixar released the Cars soundtrack and a video game alongside the film to boost sales. Media convergence combines two or more mediums such as TV, film, and radio, as seen with Adele's song Skyfall being made for the James Bond film of the same name. The key difference is that synergy can also include merchandise while convergence only involves various media products.

2.  Synergy is when more than one company comes
together to promote a product using various
media forms. E.g. Film, Soundtrack, Video games.
This is used to make more sales and give the
company more revenue
 For example - Disney Pixar’s ‘Cars’ released the
soundtrack to the film, toy cars based around the
film and also a video game to create more profit
and promote the film.
Film Soundtrack Video game

3.  Media convergence is the combining of two or
more mediums.
 Some of these mediums are: TV, Film and radio.
 An example of this is when the music industry
(Adele – Skyfall) comes together with the film
industry (James Bond – Skyfall) to produce a song
for the film
Music industry Film industry

4.  The difference between these two is that
cross media convergence involves only
media products (films, music, websites)
where as synergy can involve other
products that don’t involve the media.
(merchandise).