A Windows Service is a process without a user interface, that runs constantly in the background in its own session. This said, hit CTRL+ALT+DEL, select the Task Manager, then the Services pane, and hit the Services button. First ensure that you are using Windows, then that you have administrative rights. What you will see are the Windows Services. Friend with them, they are not malevolent.
Now that we know what is exactly a Windows Service, let’s try to create one. There are two ways to do so, the easy one with Visual Studio pregenerating all of the exciting code – and the cool way to write it by hand. You can choose any one of them, the result will be the same.
Unfortunately a service cannot be run by itself (as long as it isn’t a WCF service, but for this objective, it isn’t), so you cannot debug your services and test them with Visual Studio, which is definitely a bad thing.