Signal, like WhatsApp, is a chat app that lets you message and call friends and family using end-to-end encryption, which means your messages are more protected and can't be easily read by anyone, including Signal itself. It supports group messages and other fun features you might already use in chat apps, like GIFs, videos and pictures. It even has encrypted group video calls, though supported is limited to five people right now. It's completely free and you can use it on iPhones, Android phones, Macs, Windows PCs and Linux.
Signal isn't some massive tech company out to make money from your information, either. It's a registered nonprofit and relies on donations to operate. The free app doesn't collect your private information and it doesn't have any ads.
Here's how to use it.
That's it! Now you're up and running on Signal. If you want to use it instead of WhatsApp, you can delete your WhatsApp chats by tapping "edit" on the top-left of the chat page. Select your messages and then tap "delete." A copy of your messages may remain for other users in chats you've participated in until they also delete the chats.