As all Android users know, the official WhatsApp website usually has the updates much earlier than Google Play. Because of this, it's common for users who only trust Play to have obsolete versions of Whatsapp installed on their devices. Thanks to this app, all that can change.
The only thing WhatsApp 2Date does is notify you when a new WhatsApp update is available on the official website. Furthermore, you can download these new versions from the app's interface.
WhatsApp 2Date is one of those apps that, even if it's not essential, can be very useful for users who always want to have their apps updated to the latest version as soon as possible.