WikiNotes for Android is a form of wiki known as a personal wiki. These run on desktops or (in this case) mobile computing devices, and many people like them. They bring a bit more structure to your notes than just a list of subjects. You can choose to link notes or pages up in any manner you like.
This particular implementation uses a regular expression to match WikiWords and turn them into links that fire Intents to go to other notes. Because of the way the links are implemented, the application will also create links out of telephone numbers that take you to the dialer and URLs that start up the browser.