C#: What is async/await in C#?

1// Async method
2public async Task<string> GetDataAsync() {
3    // Await asynchronous operation
4    string result = await httpClient.GetStringAsync("https://api.example.com");
5    return result;
6}
7
8// Calling
9public async Task ProcessData() {
10    string data = await GetDataAsync();
11    Console.WriteLine(data);
12}