In C#, async and await are keywords used in asynchronous programming to simplify the development of code that performs potentially long-running operations without blocking the execution of the program. async is used to declare a method, lambda expression, or anonymous method as asynchronous. When you mark a method as async , it allows you to use the await keyword inside that method. await is used to pause the execution of an asynchronous method until the awaited task completes. The task can represent the completion of an asynchronous operation, such as reading from a file, making a network request, or querying a database. When you use await within an async method, it indicates that the method will "await" the completion of the awaited task without blocking the current thread. Instead of blocking, the method is suspended, and the thread can be used to perform other work. Once the awaited task completes, the method resumes from where it left off. Here's a simple ex