What is the purpose of the async keyword?"

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Dependency Injection (DI) in .NET is a design pattern and technique used to achieve loose coupling between classes and their dependencies. Instead of a class creating its own dependencies, they are provided (injected) from the outside—typically by a DI container. This makes the application easier to maintain, test, and extend

The async keyword is used in programming (especially in languages like JavaScript, Python, C#) to define an asynchronous function. Its purpose is to enable asynchronous programming, which lets your code perform tasks that might take some time (like fetching data from the internet or reading a file) without blocking the main thread.

Key points about async:

When a function is marked as async, it automatically returns a promise (in JavaScript) or a coroutine (in Python).

Inside an async function, you can use the await keyword to pause the execution until a promise is resolved, making asynchronous code easier to read and write, almost like synchronous code.

It helps improve performance and responsiveness, especially in applications where waiting for tasks like network requests or disk I/O is common.

Example in JavaScript:

javascript

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async function fetchData() {

  const response = await fetch('https://api.example.com/data');

  const data = await response.json();

  return data;

}

Here, async allows the function to pause on await calls and resume once the data is available, without freezing the entire program.

In short, the async keyword marks functions for asynchronous behavior, enabling more efficient and readable handling of time-consuming operations.

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