Bitmojis
An example of a Bitmoji.
On Tuesday, Snapchat announced that it's integrating Bitmoji features into the main Snapchat app.
Bitmoji is a sticker app that lets users create cartoon avatars that looks like themselves. The Bitmoji app was first launched in 2014, but Bitmoji had found traction before then with its first product, called Bitstrips, which used the same customized sticker concept.
Users will have to download the Bitmoji app separately - the feature won't be totally integrated into Snapchat. But once your settings are linked, you can send Bitmoji stickers in chat or stick them on snaps.
Here's Snapchat's official announcement:

Snapchat