University of Michigan - Ann Arbor

A computer network consists of two or more nodes (devices such as computers, phones, or servers) connected by links (cables or wireless signals) so they can exchange data. Networks provide the underlying infrastructure for modern technologies like web browsing, email, video calls, and cloud services.

Networks are commonly categorized by geographic scope:
* **Local Area Network (LAN):** Connects devices within a single location, such as a home or office.
* **Wide Area Network (WAN):** Connects networks spread across large geographic distances. The Internet is the largest WAN in existence.

The Internet is not a single centralized entity, but rather a "network of networks" consisting of millions of independent networks that communicate using shared protocols—standardized rules for formatting and exchanging data.

Learn Before

Related