The Internet is a global network of interconnected computer networks that spans the entire world. It enables communication, information sharing, and resource exchange on a global scale. Here's why the other options are incorrect:
- Option (1): Intranet: An intranet is a private network used within an organization or company. It is not a worldwide system but rather a localized network designed for internal use.
- Option (2): Webpage: A webpage is a single document or page on the World Wide Web. While webpages are part of the Internet, they are not a worldwide system of computer networks.
- Option (3): Internet: This is the correct answer, as the Internet is a global network that connects computers and devices across the world, enabling communication and data exchange on a massive scale.
- Option (4): Website: A website is a collection of related webpages hosted on the Internet. While websites are accessible through the Internet, they are not a worldwide system of computer networks.
Answer: $\boxed{\text{Internet}}$