What is C

What is c
We can say that c is programing language and we know that we need programing language to interact with computer
in detail  C is a structured, procedural programming language this language is used for operating sustems and application
reason behind using c language for operating system where we have adavanced version of c that is c++ and java and many for after that we use c that is why we know that in java there is  reference  is mean that if we write
int x=y; than value of y easily can be access 

but in c
int x=1;
ptr=&x;

so that access is not easily with C thaere is no scope of reference 

Many versions of UNIX-based operating systems are written in C. C has been standardized as part of the Portable Operating System Interface (POSIX).