Questions: What is the Internet? A software program installed on the computer A power backup source An electronic device for printing documents A worldwide collection of computer networks

The answer is the fourth one: a worldwide collection of computer networks.

Explanation for each option:

1. A software program installed on the computer: This is incorrect. The Internet is not a software program; it is a global network of interconnected computers.

2. A power backup source: This is incorrect. The Internet is not related to power supply or backup systems.

3. An electronic device for printing documents: This is incorrect. The Internet is not a physical device; it is a network infrastructure.

4. A worldwide collection of computer networks: This is correct. The Internet is a vast network of networks that connects millions of private, public, academic, business, and government networks worldwide.

In summary, the Internet is best described as a worldwide collection of computer networks.