Static keyword in C

If you are computer science student or take any programming class like c,c++ or java.you should hear about the word Static, this is the most important question and come in the exam and asked several times in interview .if we talk about static keyword in java.by creating a static function you can call them without creating the object, as you see in the main function.
, now in this post, we are discussing the static word in C.let see a program

void main()
{
      static int var = 5;
      printf("%d ", var--);
      if(var)
            main();
}