Deep Dive: Rust Ownership

By Jane Doe · Published 12 March 2026 · 8 min read

Rust's ownership model is what makes it unique among systems languages. In this article we'll walk through the three rules, with examples.

The Three Rules

1. Each value has a single owner.
2. When the owner goes out of scope, the value is dropped.
3. You can have either
   • one mutable reference, or
   • any number of immutable references
   — but never both at the same time.

A First Example

Consider this code:

fn main() {
    let s = String::from("hello");
    takes_ownership(s);
}

fn takes_ownership(s: String) {
    println!("{}", s);
}

Comparison Table

"Ownership is Rust's most unique feature." — The Rust Book

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