Internet, Wi-Fi and phone
Router
In short and in plain language
A router is a box that links your devices at home to the internet.
It usually also sends out the Wi-Fi.
Many routers can also link up phones. They can also look after the devices on your home network.
Definition
A router is the device that connects the devices in your home to the internet. It usually also provides the Wi-Fi. Many routers can also connect phones and manage the devices on the home network.