Web browser and electric fan: what they have in common

1. Step 1. Web browser — uses — World Wide Web. It displays web pages.
2. Step 2. World Wide Web — is used in — Search engine. It indexes the web.
3. Step 3. Search engine — uses — Data centre. It runs in data centres.
4. Step 4. Data centre — has part — Air conditioner. Cooling.
5. Step 5. Air conditioner — is a kind of — Household appliance. A household appliance.
6. Step 6. Household appliance — includes — Electric fan. A household appliance.

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