In Rust, the `@` symbol is primarily used within pattern matching contexts. It enables you to bind the matched value to a variable during pattern matching. This allows you not only to verify if the value matches a specific pattern but also to reuse it later in your code.

```rust
let value = Some(5);

match value {
    Some(x) @ Some(5) => println!("Got an Some with 5, and x is {:?}, x),
    _ => (),
}
```

In this example, we use `@` to bind the value matched by `Some(5)` to the variable `x`, enabling you to utilize `x` within the `println!` macro.

What is the purpose of the '@' symbol in Rust?