it was there before the most recent update.. dunno what exactly its is or how to use it..lol gonna have to look into it.. i rem hearing about it when the s4 was first released
you are all incorrect. KNOX is supposed to act as an encrypted portion of your phone with its own apps that all run in an approved secure environment. You have to access this environment via a toggle switch but there is NONE available nor are there apps that are KNOX approved. From my understanding there will be specific KNOX approved apps and a KNOX store that you download from. Currently none of this is available. I do see the KNOX process and it may be running in background but just not able to access features yet.