The software which performs all necessary tasks in a computer is ?

The operating system is the main software that performs all the essential tasks required for a computer to function properly. It manages both hardware and software resources, handles input and output operations, manages memory, controls files, and allows the execution of other programs.

The OS acts as a bridge between the user and the computer hardware. Without it, a user cannot operate a computer system in any meaningful way. It enables you to open applications, browse the internet, play videos, save files, and much more. Examples of operating systems include Microsoft Windows, macOS, Linux, and Android.