Which programming language is used to develop operating system?

Most operating systems like Windows, iOS, Linux, Ubuntu and Android are written using a combination of C and C++.

Windows uses a kernel written in C, with applications in C++.

Android also uses some Java for application framework, along with C and C++.

But in general, C and C++ are the main languages.

How an operating system is made?

Operating systems allow people to interact with computer hardware; they’re made out of hundreds of thousands of lines of code. They are usually made with C#, C, C++, and assembly. Operating systems allow you to navigate through a computer while creating storage and executing commands.