If you've ever watched an AI chatbot “type” its answer word by word, you’ve already seen Server-Sent Events (SSE) in action. That smooth streaming experience—where text appears token by token instead of waiting for the full response—is one of the reasons modern chat UIs feel fast and alive. But here’s the interesting part: Many developers assume this must be powered by WebSockets. In reality, a huge number of AI chat apps use SSE instead . And honestly? For most chat interfaces, SSE is often the better choice. Quick Summary SSE is great for chat UI because: It streams AI responses in real time It avoids constant polling It uses standard HTTP (simpler infra) It automatically reconnects if the connection drops It’s lighter and easier to scale than WebSockets for one-way updates If your app mostly needs server → client streaming , SSE is probably all you need. What is SSE?…