What is the difference between char array and char pointer in C?

I am trying to understand pointers in C but I am currently confused with the following:

• char *p = "hello"
  

  This is a char pointer pointing at the character array, starting at h.

• char p[] = "hello"
  

  This is an array that stores hello.

What is the difference when I pass both these variables into this function?

void printSomething(char *p)
{
    printf("p: %s",p);
}