Native to iOS, iMessage has many capabilities all nested within this one application. For instance, iMessage can be used solely on Wi-Fi and still allow iOS users to communicate without incurring a text messaging charge. iMessage also works with Apple Pay, and users can transfer money to fellow iPhone users right within iMessage.
iMessage also provides a richer texting experience. Users can share gifs, drawings, screen effects, stickers from their favorite applications, and even share music. Plus you can react to individual messages thanks to Force Touch.