Creating a convenient interface between the utility and the computer

About operating systems. The first computers lacked operating systems. Each program running on the first computers had to contain all the code needed to run on the computer, communicate with the built-in hardware, and perform the calculations that the program had to performWhen the computer is started, the operating system is loaded first, so we can consider operating systems as the main programs running on the computer. The main functions of operating systems include:
Input and output control.
Creating a convenient interface between the utility and the computer.
Computer device management
Computer control based on user instructions
Computer resource management
Ensuring that computer devices work properly with programs and are integrated into one.
Ensuring that programs work on all computers, etc.
Examples of currently most commonly used operating systems are: Window(7, 8.1, 10, 11), it's Android, Mac, IOS, Linux and Unix. According to the interface of the programs, we can divide into two types:When working with a program with a nographic – nographic interface, only the keyboard can be used, and the data is only in the form of text.When working with a program with a graphical – graphical interface, the keyboard and mouse can be used, while the data will be in the form of text and graphics.