Fake Door Testing means that we show your user an option that is not actually exists. After the user clicks or registers (or takes another action), the system replies that this feature or product is not yet ready. By measuring how many of your visitors have clicked (or registered), we can tell whether the feature or the product will be used by your users or not. It needs to be mentioned that Fake Door Testing only works if you already have a website or an application, and you also have some traffic on it. On the landing page created for the new feature or product, we can ask your user to provide an email address, so you can notify your users of the launch of the new addition. Consequently, if you decide to implement the new feature, or launch the new product, you will already have a database of users who are interested in it.