Home networking can seem confusing, but in simplest terms there are really only three components necessary to get up and running. The first is your Internet Service Provider (ISP), or the company that provides you an Internet signal. The second is the modem, which is the device that connects to the service from inside the house. The third is the router, which converts everything to a wireless signal for dispersal to devices such as phones, tablets, and computers. Of these, the modem is the heart of any home network. If you are in the market to install or upgrade your own system, these modem-buying tips will get you pointed in the right direction.