What is an asynchronous programming in terms of c#?

What is an asynchronous programming in terms of c#?
Asynchronous programming in C# is a technique that allows developers to execute tasks without blocking the main thread of an application. In synchronous programming, tasks are executed sequentially, which can result in the application becoming unresponsive while waiting for a long-running task to complete.
Asynchronous programming solves this problem by allowing tasks to be executed in the background while the main thread continues to perform other tasks. In C#, asynchronous programming is achieved using the async and await keywords.
The async keyword is used to define a method that can be executed asynchronously. When a method is marked with the async keyword, it is compiled into a state machine that allows it to execute asynchronously.
The await keyword is used to indicate that a task is being executed asynchronously, and that the calling thread should not block while the task is executing. When the await keyword is used, control is returned to the calling thread, allowing it to perform other tasks while the awaited task is running.
Asynchronous programming is especially useful when performing I/O-bound or CPU-bound operations that take a long time to complete. I/O-bound operations, such as reading from a file or making a network request, can be executed asynchronously, allowing the application to remain responsive while the operation is being performed. CPU-bound operations, such as complex calculations, can also be executed asynchronously, freeing up the main thread to perform other tasks.
Overall, asynchronous programming in C# provides a way to execute long-running tasks without blocking the main thread of an application, resulting in better performance and a more responsive user interface.

What do you mean by compiled into a state machine?

In C#, when a method is marked with the async keyword, it is compiled into a state machine. A state machine is a programming construct that is used to represent a set of states and the transitions between them.
In the case of an asynchronous method, the state machine is used to represent the different stages of the asynchronous operation, such as starting the operation, waiting for it to complete, and handling any exceptions that may occur.
The state machine is created by the C# compiler at compile time and is used to implement the asynchronous behavior of the method at runtime. When the asynchronous method is executed, it enters the first state of the state machine, and as it progresses through the different stages of the operation, the state machine transitions between different states.
The state machine is used to manage the execution of the method, ensuring that the correct code is executed at the appropriate time and that the calling thread is not blocked while the asynchronous operation is running.
Overall, the state machine is a key component of C#'s async/await system, allowing developers to write asynchronous code in a simple, easy-to-understand way while still providing powerful performance benefits.

public Task GetAll(); How about in this case when we don't have async keyword?

If you do not use the