Synchronization is a way to create a thread-safe code where only one thread can access the resource at any given time.
Asynchronous call waits for the method to complete before continuing with the program flow. Synchronous programming badly affects the UI operations, when the user tries to perform time-consuming operations since only one thread will be used.
In Asynchronous operation, the method call will immediately return so that the program can perform other operations while the called method completes its work in certain situations.
In C#, Async and Await keywords are used to achieve asynchronous programming.