Why sizeof("xyz") is 4?

Question

whenever passing a string of length 'l' in the sizeof() operator it returns the length of string + 1. How is it working for strings?

Answer 1

Because it is null terminated.

Answer 2

Whenever we use double quotes it means Compiler treats it as a string.
At the end of string there is always a null character i.e. \0
So including it,the result becomes 4

Answer 3

Cool, So it was null character i am missing.
thaknx @abhishek and @helioform