Difference between printf and echo in Bash

Question

$ printf \'apple\' | wc -m
       5
$ echo \'apple\' | wc -m
       6

Why printf prints 5 and echo prints 6 characters?

Answer 1

Here is the difference ..

$printf 'abcd'
abcd$ echo 'abcd'
abcd
$

As you can see the additional char is newline \n