What is the difference between .await and .block_on()?

Question

Accepted Answer

**.await** — suspend async task. **.block_on()** — run future to completion.

**.await:**
- Suspending.
- Non-blocking.
- In async context.

**.block_on():**
- Blocking.
- Runs future.
- In sync context.

```rust
// .await in async
async fn get_data() {
    let data = fetch().await;
    println!("{}", data);
}

// .block_on in sync
fn main() {
    let rt = tokio::runtime::Runtime::new().unwrap();
    let data = rt.block_on(fetch());
    println!("{}", data);
}
```

**Key:** .await in async, .block_on in sync.

Rust: What is the difference between .await and .block_on()?