String size

Question

In string, when I'm declaring the size of the string, do I need to declare 1 character more than the size?

Like if the string is 10 character long then does the size need to be 11?

If so then why?

Answer 1

Because every string has the end character: '\0'
so the string "hello" == the array of characters {'h', 'e', 'l', 'l', 'o', '\0'}

Answer 2

What does '\0' means?

Answer 3

https://en.m.wikipedia.org/wiki/Null_character