The two main categories of software program are application software program as well as system software. The most usual kind of software application, application software is a computer system software application package that performs a details function for a user, or in some instances, for one more application. System software http://tdcn.hou.edu.vn/index.php?language=vi&nv=statistics&nvvithemever=t&nv_redirect=aHR0cHM6Ly9zb2Z0d2FyZS10b29sLmNvbQ/ZD1wb2tkZW5ndGhhaS5vbmxpbm