Library String and String Literals are different

[EwCjE3v7]

What do they mean when they say this in my book?
"String literals are not standard library strings"

[LB]

String literals are of type char const * - that is, a string literal evaluates to a pointer to the first character, and the character of the string literal are constant.

The std::string type is a class with data members and member functions, on the other hand.

There are also different kinds of string literals, like wide string literals and utf8 string literals:
http://en.cppreference.com/w/cpp/language/string_literal

[EwCjE3v7]

Thank you L B.