How does async await work in Rust

Async/await in Rust allows you to write non-blocking code that looks synchronous by pausing execution at .await until a future completes. You define an async fn to return a future, then chain .await on operations like trpl::get(url) to wait for the result without blocking the thread.

use trpl::Html;

async fn page_title(url: &str) -> Option<String> {
    let response_text = trpl::get(url).await.text().await;
    Html::parse(&response_text)
        .select_first("title")
        .map(|title| title.inner_html())
}

Async/await lets your program start a task, like downloading a webpage, and immediately do other work instead of waiting idly. It's like ordering coffee at a busy shop: you get a number and wait elsewhere until your order is ready, rather than standing at the counter staring at the barista. You use this pattern whenever you need to perform slow operations like network requests or file I/O efficiently.