These days when you use Whatsapp a pop-up message on your chat window. That is a good service from whatsapp company. When you activate the End-To-End Encryption your chat, photos, videos, document, calls are more secure than previous version. If you activate the service your data is convert in encryted form.
-First of all you make sure that you’re using the latest version of WhatsApp on your Android Phone. -Open any chat on your WhatsApp that you want to secure. -After open chat here come a pop-up or message of End-To-End Encryption. Click on this message and tap on verify after it here open a QR Code screen. -You will either have to scan the QR code on your contact’s phone, or you will have to ask them to scan your code. You will have to do the same process on your recipient’s device to reach the QR code scanning stage. -After all thing complete you can confirm it from contact info on end to end encryption indicator.