Memojis are highly customizable, with multiple options for skin colors, hairstyles, head shapes, eyes, eyebrows, facial hair, eyewear, and headwear.
Once a Memoji has been created, it can be used just like an Animoji, with the iPhone X's facial recognition sensors mimicking real-time facial expressions and head movements. Starting with iOS 12, that includes wink and tongue detection.
The existing set of Animoji is also expanding to include a ghost, koala, tiger, and tyrannosaurus rex in iOS 12.
Memoji can only be created on the iPhone X, but they can be sent in Messages across most Apple devices. They can also be used in FaceTime video chats, alongside other new camera effects and filters such as "comic book" and "watercolor."
Memoji are similar to Samsung's new AR Emoji, but they also share a similar concept with Bitmoji on Snapchat.