Rust just opens up the kimono and exposes bare metal details about strings. A string with quotes goes into the executable. A `String` exists at runtime and is

Rust just opens up the kimono and exposes bare metal details about strings. A string with quotes goes into the executable. A `String` exists at runtime and is an entire string. An `&str` is a slice of a string: it points to an existing string for a certain number of characters. Not all programs or programmers require this amount of knowledge, but if you want to understand programming at a deeper level, Rust is a great tool to dive into the deep end to understand complex topics about programming languages.