What is a string ?

Answer 1

it's simply plain text.

Answer 2

string is data type included in string.h
but basiclly its an array of chars.
complier knows when it ebds by phai or null charcter \¤ like "Hello\¤"
which allows make n+1
means: "Hi" => IT SIZE 3 BUCAUSE OF NULL CHARCTER
hope you got it.