Name the metal which is extensively used in a printed circuit board.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question:** The question asks for the name of a metal that is extensively used in printed circuit boards (PCBs).

2. **Identifying Printed Circuit Boards:** Printed circuit boards are essential components in many electronic devices, including computers, mobile phones, and various gadgets. They consist of a non-conductive layer with circuits made on them.

3. **Determining the Metal Used:** The primary metal used in printed circuit boards is copper.

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