Computers are devices that simply run programs and follow orders given to them. Combine that technology with millions of other computers in a network and you instantly get access to a treasure trove of information. All modern computers come with some networking hardware that helps you connect to the internet or other devices. Based on your requirements you may have to buy specialized equipment to further enhance your computer's capabilities to include more functions. In a way networking devices are units that mediate or control the data traffic in a computer network.