If you were any bit of a gamer in the late 80s/early 90s, then you know the impact Sega had on the gaming industry. From bloody Mortal Combat games to the introduction of Sonic the Hedgehog, the console seemed to have it all. But what happened to Sega? How did it go from a sensation that dominated much of the gaming world to a nobody when the Dreamcast completely flopped? This video from Business Insider brings us the Sega story in 7 minutes. Prepare yourself for a bit of nostalgia, as well as some great business lessons to remind us all what happens when we focus our development in the wrong areas.