A network is two or more computers - or other electronic devices - that are connected together for the purpose of communication. They are connected by a wired medium such as cables, or by a wireless medium such as Wi-Fi.
A computer or device that is not connected to a network is called a stand-alone.
Today, many different types of computer are connected to some form of network. As well as PCs, many other devices such as smartphones, smartwatches, fitness trackers, car engine management systems, internet-enabled fridges, intelligent personal assistants and media boxes can all be connected.
Computer networks bring several benefits:
On larger networks, such as those used by businesses and schools, there are additional benefits:
Computer networks can also bring several problems: