Asynchronous Operation Online

Async operations prevent the user interface (UI) from freezing.

CPUs are not wasted waiting for slow I/O operations (network, disk). 4. Common Use Cases Fetching data from an API ( fetch() or axios ). Database operations (writing or reading large datasets). File system operations. Timer events ( setTimeout ). 5. Example (JavaScript) javascript asynchronous operation

Frontend applications remain interactive. Async operations prevent the user interface (UI) from

Traditional functions passed to be executed once a background task completes. 3. Why Should You Use Them? fetchDataAsync().then(data => console.log(data))

// Synchronous (Blocks) const data = getDataSync(); console.log(data); // Waits for data // Asynchronous (Non-Blocking) console.log("Start"); fetchDataAsync().then(data => console.log(data)); console.log("End"); // Runs immediately, before data arrives Use code with caution. Copied to clipboard

Backend systems can handle thousands of concurrent requests without needing thousands of threads.