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 can be connected, such as smartphones, smartwatches, fitness trackers, car engine management systems, internet-enabled fridges, intelligent personal assistants and media boxes.
Computer networks bring a number of benefits:
On larger networks, such as those used by businesses and schools, there are additional benefits:
Computer networks can also bring several problems: