Hello grag

hope you are doing well and safe. With reference to your query,  I would glad inform you that for running applications and utlities requires a platform to their process on . That platform is known as operating system.It works as a bridge to perform better interaction between application programs and hardware of the computer . It performs all the basic tasks like memory management .For example-Unix,MS-dos,ms-windows ,etc

Hope you found this answer informative. Best wishes for your future