Networks form the backbone of today's technology infrastructure. They are what have enabled the rapid growth in use of computers to perform any number of tasks. They help us keep in touch via e-mail and video conferencing. They are even becoming critical components of traditional businesses such as the phone and cable companies.
Generally speaking, networks can be divided up into LANs, MANs, WANs, and internetworks, each with their own characteristics, technologies, speeds, and niches. LANs cover a building, MANs cover a city, and WANs cover a country or continent. LANs and MANs are unswitched i.e. do not have routers whereas WANs are switched.
This list is by no means complete so if you'd like something defined feel free to contact us.