What is a Chat API? And how to guarantee message delivery on any network?

A Chat API is the backend engine that powers real-time messaging inside your app. It handles everything from sending a "hi" to delivering rich media, managing group conversations, and syncing messages across devices. But here's the catch: a Chat API is only as good as its ability to deliver every message, on any network, anywhere. And that's where most solutions fall short. To understand why, you need to look at the three transport protocols that power the internet—and their trade-offs. TL;DR: T