Key logger application as the name suggests is an application developed in c# to log all kind of keys available in the today's standard keyboard. It is a kind of application that runs in the background without the knowing of user who is using the system.
Key logger is not a window service actually rather a windows application which is running in minimized mode. When the application is started then it will log all the keys being pressed by anyone, anywhere on the system. By the term anywhere it actually means anywhere means whether the key is pressed on any application ,any word formatter like MS word, MS excel etc ,any where on the browser or any other way.