String is a type of data structure in the Rust programming language that is allocated on the heap. It is a vector of bytes (Vec<u8>) and is not null-terminated. It is owned by the caller and can be modified. String is growable, meaning it can be resized to accommodate additional characters or strings.

&str is a string slice that is a reference to some UTF-8 encoded string data stored elsewhere. It is not growable and is null-terminated. It is borrowed and cannot be modified. A string slice is a fixed-length view into a string, and it is often used when passing strings as function arguments. The length of the string slice is determined at compile time, so it can not be changed.
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