As it is clearly mentioned in title that I want know the difference between Software manager and package manager in Linux. I want to know these things because I want to know this package manager that contains downloads are trust worthy or not. They can infect my system or not. I have heard that this package manager download contains virus. If this thing is trusted like Wine then there is nothing to worry about but I need the confirmation related to that. I hope you have understood the problem that I am facing and now I need to know the solution for the same.