Answer:

The answer is:  VoIP.

Step-by-Step explanation

VoIP, which stands for Voice over Internet Protocol, is a technology that allows you to transform audio signals, signals like those of a phone call, into digital data that can, and is, transmitted over the Internet or other mode of computer networking that is IP (Internet Protocol) based. VoIP has effectively presented itself as a substitute for traditional methods of long distance communication, bringing with it the possibility to make free phone calls, but with one limitation, the service only works if you call another VoIP system. VoIP can work in two ways, being calls made from: computer to computer and computer to landline or cell phone. When the call is made from one computer to the other, everything is spoken through a headset or microphone. The audio is transformed into binary information and sent over the internet. When the call is made from a computer to a telephone or cell phone, your voice is also transformed into binary information and sent over the internet until it reaches a telephone exchange and is transformed into analog signals (which is the signal that telephones and cell phones receive).