GB WhatsApp is a modified version of the popular WhatsApp messaging application. It was not developed by the official WhatsApp team and is considered a third-party application. GB WhatsApp offers some additional features and customization options that are not available in the official WhatsApp application. Some of these features include:

1. Customization: GB WhatsApp allows users to customize the look and feel of the app by changing themes, fonts, and chat backgrounds.

2. Privacy: It offers more privacy features, such as the ability to hide your online status, hide the blue ticks that indicate that a message has been read, and hide the "typing" status.

3. Dual WhatsApp: GB WhatsApp allows users to run two WhatsApp accounts on a single device, which can be useful for those who have a personal and a work WhatsApp account.

4. Media Sharing: You can send larger video and audio files, as well as more images at once, compared to the official WhatsApp.

5. GB WhatsApp or any other third-party WhatsApp mod is not recommended and may violate WhatsApp's terms of service. WhatsApp regularly updates its security features, and using unofficial versions of the app can pose security risks and may result in the suspension or banning of your WhatsApp account.

   Furthermore, the use of third-party WhatsApp mods is not supported by WhatsApp, and you may not receive official updates or support for any issues you encounter while using them. It's generally safer and more secure to use the official WhatsApp application provided by WhatsApp.