In future, you can send WhatsApp stickers in chats.
Since last year, it’s possible to add stickers to photos and videos in WhatsApp. In hidden parts of the application, WABetaInfo discovered that WhatsApp is working on stickers for chats.
The stickers can be selected by a new button in the text field and appear in chats outside the chat bubbles. The time and checkmarks (read receipts) appear below the sticker, as shown in the following screenshot:
As it looks now, WhatsApp will use Facebook’s stickers.
The feature is found in hidden parts of the iOS app, but not yet on other platforms. It will probably take some time before we can actually use WhatsApp stickers.