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An asynchronous function in C# is usually implemented using the keywords async and await. When such a function is called, a Task is created, which runs independently of the main thread.

Inside an asynchronous function, when await is encountered, execution is temporarily suspended, and control is returned to the calling code. When the awaited operation completes, the function continues execution from where it was suspended.

It is important to note that asynchrony does not necessarily mean creating a new thread. Often, a single thread is used that switches between tasks without blocking the main UI or processing thread.

Example:

public async Task<string> GetDataAsync()
{
    var data = await DownloadDataAsync(); // asynchronous loading
    return data;
}

Here, DownloadDataAsync is started, and the thread is not blocked while data is being loaded.