Is Game Development or Apps development is a multi billion $ Business?

[Ali]

Hi to all I saw a post recently on net where they were saying that the game development is a multi billion $$ business...is it really...??

Are apps developer and game developer are same....??

What steps are should be taken to enter himself in game and apps development??

Kindly discuss this and guide me I saw this because I study this that If we are good at game development and apps development then 90% are chances are that you can create your own company as this gives you a big money $$$$ in return like through popular sites..facebook and so on.