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+# Async Programming in Rust
+
+Asynchronous programming in Rust allows you to write concurrent code that's both fast and safe.
+
+## What is Async?
+
+Async programming is about doing multiple things at once without blocking. Instead of waiting for one operation to complete before starting another, async code can switch between tasks.
+
+## Key Concepts
+
+### Futures
+
+A `Future` represents a value that may not be available yet:
+
+```rust
+async fn fetch_data() -> String {
+    // Simulate async work
+    tokio::time::sleep(Duration::from_secs(1)).await;
+    "Data fetched!".to_string()
+}
+```
+
+### Async/Await
+
+The `async` keyword makes a function asynchronous, and `await` pauses execution until a future is ready:
+
+```rust
+async fn process_data() {
+    let data = fetch_data().await;
+    println!("Got: {}", data);
+}
+```
+
+### Runtimes
+
+Rust doesn't have a built-in async runtime. Popular choices include:
+
+- **Tokio**: Full-featured runtime
+- **async-std**: Standard library approach
+- **smol**: Minimal runtime
+
+## Example: Concurrent HTTP Requests
+
+```rust
+use tokio::task;
+
+async fn fetch_all() {
+    let task1 = task::spawn(fetch_url("https://api1.example.com"));
+    let task2 = task::spawn(fetch_url("https://api2.example.com"));
+    let task3 = task::spawn(fetch_url("https://api3.example.com"));
+
+    let (result1, result2, result3) = tokio::join!(task1, task2, task3);
+}
+```
+
+## Benefits
+
+- **Performance**: Handle thousands of connections efficiently
+- **Resource Usage**: Lower memory and CPU usage
+- **Scalability**: Build systems that scale
+
+Async Rust might seem complex at first, but it's worth learning for building high-performance applications!