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Wifi routers are electronic devices that enable wireless communication between devices and a network by transmitting data signals. These devices typically connect to a modem to establish an internet connection and create a local network within a home or office space. Wifi routers allow multiple devices, such as smartphones, laptops, and smart home devices, to access the internet simultaneously without the need for physical cables. They often feature security protocols to protect the network from unauthorized access and provide options for customization of network settings.