Difference between arrays and pointers in C

main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int example(int* l) {
    return 0;
}

int main(int argc, char* argv[]) {
    int arr[3];
    arr[0] = 1;
    arr[1] = 2;
    arr[2] = 3;
    
    int *arrp = arr;
    
    int* p = malloc(3 * sizeof(int));
    p[0] = 1;
    p[1] = 2;
    p[2] = 3;
    
    example(p);
    example(arr);
    
    printf("%llu %llu\n", sizeof(arr), sizeof(p));
    
    free(p);

    return 0;
}