The correct answer is the Internet. The Internet is an example of a wide area network $($WAN$).$ A wide area network is a network that covers a large geographic area, such as a city, country, or even the entire world. It connects multiple local area networks $($LANs$)$ or other WANs together, allowing for communication and data transfer between different locations. The Internet is a global network of networks that spans across the globe, connecting millions of devices and users together. It is the largest and most well$-$known example of a wide area network.