Question

Software that controls a computer. an os controls how system resources are used and provides a user interface, a way of managing hardware and software, and ways to work with files.

Answer 1

For bad software, probably a virus/malware/ransomware kind of thing. If it is good software, probably a program that organizes your files, adjusts certain things, but do not record your files (no programs are at the top of my head, sorry).