An app to update to the latest version of WhatsApp for Android.Beta Whatsapp Updates Lite for WhatsApp checks the latest beta version available on whatsapp.com and enables you to install it automatically.
WhatsApp publishes beta updates on their website before they become available on Google Play. This means that the latest features aren't available on Google Play until several weeks later (like audio calls, backup to Google Drive and new UI changes).
When a user wants to have these beta updates, the regular method is downloading the APK file from the website and installing it manually. Beta Updater does that automatically.