What is a modem?
A modem was a device that let computer connect to the internet over a dial-up connection.  This connection is established and hosted through an ISP or Internet Service Provider.  The three most common types of modem connection are dial-up, DSL, or cable.  DSL was a lot faster than dial-up, and cable modem connection was the fastest.
O que é um modem?
Um modem era um dispositivo que permitia que o computador se conectasse à internet através de uma conexão dial-up. Esta conexão é estabelecida e hospedada através de um ISP ou Provedor de Serviços de Internet. Os três tipos mais comuns de conexão de modem são dial-up, DSL ou cabo.