c - Why does the "Hello" inside the string array have a size 4? -

the code in question:

#include <stdio.h>  int main(void) {   char *a[10] = {"hi", "hello", "how"};  printf("%d\n", sizeof(a));   printf("%s\n%s\n%s\n", a[0],a[1],a[2]);  printf("%d\n%d\n%d\n", sizeof(a[0]),sizeof(a[1]),sizeof(a[2]));   printf("%d", sizeof("hello"));  return 0; } 

output:

40 hi hello how 4 4 4 6 

i have no idea why happening , looked reference sizeof on cppreference. still have no clue why returning 4 "hello" when should need 6 store it.

it print size of pointer not string content itself. of size printed 4 bytes.