Recommender system and optical telegraph: what they have in common

1. Step 1. Recommender system — is used in — Video hosting. Recommendations.
2. Step 2. Video hosting — uses — Streaming. Streaming.
3. Step 3. Streaming — uses — Internet. Transmission over a network.
4. Step 4. Internet — uses — Packet switching. Data is sent in packets.
5. Step 5. Packet switching — works like — Electrical telegraph. An analogy: telegraph messages were passed from station to station with intermediate storage — a “store and forward” principle similar to packet transmission.
6. Step 6. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.

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