Chip package and electrical telegraph: what they have in common

1. Step 1. Chip package — has part — Solder. BGA solder balls.
2. Step 2. Solder — is used in — Printed circuit board. Components are soldered on.
3. Step 3. Printed circuit board — has part — Copper wire. Copper traces.
4. Step 4. Copper wire — is part of — Electrical telegraph. Communication lines.

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