How does the backend work in real-time applications used by companies?

[achieversit09]

[SueShe]

The internet says the following

The backend is the "engine" of a real-time application. It runs on remote servers and manages the complex logic, data processing, and state synchronization that happens behind the scenes.

Here is exactly how corporate backends operate at a glance:
Persistent Connections (WebSockets): Unlike traditional HTTP requests (which open and close), real-time backends use protocols like WebSockets or gRPC to establish a single, open connection. This allows data to flow instantly and bidirectionally.

Event-Driven Architecture: The backend acts as a central hub listening for "events" (e. g., a user sending a message, a driver moving on a map, or a stock price ticking up).

Message Brokers: To process thousands of events simultaneously without crashing, the backend relies on distributed message brokers (like Kafka or RabbitMQ) to queue, sort, and route traffic.

Real-Time Databases & Caching: The backend continuously reads and writes to ultra-fast memory caches (like Redis) or real-time NoSQL databases, pushing state changes out to subscribed clients instantly.

Business Logic & Security: The server evaluates who is making the request (Authentication), determines if they are allowed to see the data (Authorization), and processes all rules or calculations before broadcasting the update to other users.

[Anonymous]

Again, you tell us.

[Veronika_p]

A question?

[FrodoSkywalker007]

? Umm