History of programming language

Assembly (1940s) is a low-level programming language (hardware-related) that was more commonly used for computers at that time,

High-level languages

IBM Machine Systems developed the first commercialized high-level programming language (human communication) called Fortran (1957). Fortran is a programming language built with assembly code. Later, Basic (1964) , Pascal (1970) , Which created one to one in assembly language

Dennis Ritchie (Computer Science) developed a language for building an operating system called Unix (1969-1973), which consisted of several programming languages ​​called an assembly, algol (1958), FORTRAN, B (1969) all written, or ended in assembly language. All computer engineers turned to this language because all operating systems were commercialized in this language and it was easier than other programming languages.

After C, other languages ​​were written with C language, such as Python, C++, C#, PHP, and…

Programming Languages for operating systems

C++ is a language that is directly related to the C language, in which the graphic language can also be written. This language was created in Bell Labs. Basic operating systems used both C (1972) and C++ (1985) to build graphical operating systems such as Windows.
Almost all graphical operating systems are made of C++ and the kernel is written in C, such as android (based on FreeBSD (Monolithic kernel) and Linux (Monolithic kernel) ), IOS (Hybrid kernel) (based on FreeBSD (Monolithic kernel), macOS (Hybrid kernel) (based on FreeBSD (Monolithic kernel) ), Debian (based on Linux (Monolithic kernel) ), windows (Hybrid kernel) (based on DOS / OS (Monolithic kernel) with a few changes).

So what is the purpose of PLP? And what is he supposed to do?