Yes, you can move WhatsApp to an SD card. To do so, open WhatsApp and tap Menu > Settings > Chat settings > Save to SD card.
On Android, you can change the default storage location for WhatsApp by going to Settings > Apps > WhatsApp > Storage. Tap on “Change” and select your desired storage location.
To backup WhatsApp messages to a memory card, you will need to export them from the app. On an iPhone, open WhatsApp and go to Menu > Settings > Chat Settings > Export Chat. Select the chat you want to export and choose a location on your phone to save the file. On an Android phone, open WhatsApp and go to Menu > Settings > Chats > Backup chats. Tap the menu icon in the top-right corner and select Export chat.
There are a few ways to do this, but the easiest is to use an app called App2SD. This app allows you to move apps to your SD card, and it doesn’t require root access. Simply download and install the app, then open it and select WhatsApp from the list of apps. Tap the “Move to SD card” button, and the app will be moved.