WhatsApp is a messaging app with over 1 billion active users. It’s one of the most popular messaging apps on the planet, and it’s also one of the most secure. To sign in to WhatsApp, you need to first open the app and sign in with your phone number or Facebook account. After you’ve signed in, you’ll see a list of your contacts. Tap on one of them to open their chat window. To sign out of WhatsApp, just close the app and sign out from your phone or computer. ..
