Modem refers to modulator-demodulators. It's an electronic device takes analog carrier signals and modulates them to encode digital information. It also demodulates carrier signals to decode the same digital information. Modems are unique in that they can be used over any method that transmits analog signals. 4modems.com is you source for modems and modem related products. We carry a wide selection of products manufactured by the brands you can trust. We are able to offer these products at reduced prices because we keep our overhead down. Why buy from those retail stores that have to employ dozens of associates as well as the cost of their retail space. Who do you think pays for that? You do by the retailers jacking up the price to pay for them. We cut out the middle man and bring you great modems at great prices here at 4modems.com.