With the new update of WhatsApp, it has added an extra layer of biometric security, i.e. now you can open Whatsapp with your predefined Fingerprint impression.
Earlier security Pin option was there but now you can add your fingerprint also to open your app in order to preserve your chatting, conversation or call logs. Its a step towards time-saving and one hand mobile operation mode.
So how can we enable it –
Go to Whatsapp Setting → Accounts → Privacy → (Scroll Down) Fingerprint Lock → Unlock your Fingerprint – Here you go.