In Rust, String and &str are two different types that represent strings of characters.

String is an owned string type, stored in the heap and mutable. It is dynamically resizeable, allowing you to append or remove characters after creation. String is allocated on the heap and has a longer lifetime than stack-allocated strings. Here's an example of creating a String:

let my_string = String::from("Hello, World!");

&str is a string slice, a reference to a string stored elsewhere such as in a String or string literal. It is stored in the stack, making it faster to access than a String, but it is also immutable and cannot be modified. Here's an example of creating an &str:

let my_str: &str = "Hello, World!";

In general, use &str when you don't need to modify the string and String when you do. &str is faster and has a lower memory overhead than String, but it is also more restrictive as it is immutable.
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