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VoIP stands for Voice over Internet Protocol. It's a special ISP technology that allows you to make telephone calls over your Internet connection. If you have a cable, DSL, or ISDN connection, you'll have enough bandwidth. The quality is not quite as good as a standard phone call, but the price is significantly cheaper. It is not unheard of for international VoIP calls to cost just pennies per minute. You'll need special hardware and software though to make use of it.