The set of instructions is nothing but a program a set of programs is nothing but software.
Software is three types System software, Application software, utility programs.
System software is nothing but a system oriented software it means these software’s are system related software. e.g.: operating system software (windows 98,xp,windows7,8 etc)
Application Software is nothing but an application oriented software like MS office,tally software
utility programs is nothing but a special software like drivers software, printers software, and device driver software.
the relation between a software and a hardware is inter dependency on each other with only software we cannot work with computer or with only hardware we cannot work with computer .it means if we want to work with computer we need software and hardware