Pourquoi C traite-t-il les paramètres du tableau comme des pointeurs ?

void fun(int a[]) {
…
}
void fun(int *a) { //more efficient.
…..
}

#include

void display1(int a[]) //printing the array content
{
   int i;
   printf("</p><p>Current content of the array is: </p><p>");
   for(i = 0; i < 5; i++)
      printf(" %d",a[i]);
}

void display2(int *a) //printing the array content
{
   int i;
   printf("</p><p>Current content of the array is: </p><p>");
   for(i = 0; i < 5; i++)
      printf(" %d",*(a+i));
}
int main()
{
   int a[5] = {4, 2, 7, 9, 6}; //initialization of array elements

   display1(a);
   display2(a);
   return 0;
}

Current content of the array is:
4 2 7 9 6
Current content of the array is:
4 2 7 9 6