CONCEPT
Publish / Subscribe (Pub/Sub)
Summary
Pub/Sub allows one system to send data and others to receive it in real time.
Core Idea
Like a radio broadcast: one sender, many listeners.
Key Components
- Publisher
- Topic
- Subscriber
How It Works
- Publisher sends data
- System distributes it
- Subscribers receive updates
Why It Matters
- Real-time updates
- Scalable architecture
In Excel (Runline U)
Excel acts as both publisher and subscriber.
Common Patterns
- Live dashboards
- Shared data feeds
Misconceptions
- Data is not copied; it is streamed
Related Concepts
- ../examples/pubsub/basic-realtime-sharing.md