You order food, receive a buzzer, and sit down to check your email while the food cooks. 2. Key Concepts & Techniques
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
The immediate response from an async call is a "promise" that a value will exist later, allowing the program to handle it once it arrives. You order food, receive a buzzer, and sit