# Real-Time Stack

> **WebSockets, SSE, real-time architecture** — shared by both the [indian-sde-faang lane](../lanes/indian-sde-faang/INDEX.md) and the [abroad-full-stack lane](../lanes/abroad-full-stack/INDEX.md).

| Section | Files | Topics |
|---------|------:|--------|
| [WebSockets](websockets/INDEX.md) | 8 | Socket.IO, SSE, real-time architecture, NestJS WebSockets, WebTransport |

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**Lane-specific overlays:** Add interview strategy context, behavioral stories, and prep plans in [Interview Lanes](../lanes/INDEX.md) — the stacks stay stack-pure.