In simple words, VoIP or Voice over Internet Protocol is a technology that allows one to make phone calls over a broadband internet connection. In this, Voice signal ( analog sound signal)is first converted to a digital signal. Then this signal is converted to IP packets. These IP packets travel through congested networks independent of each other. With the help of high speed internet connection and by installing certain VoIP software as well as hardware, people can talk unlimited at limited costs.

To make a call using VoIP technology you need:

VoIP hardware:- VoIP hardware is basically an analogue telephone adaptor (ATA) which connects your phone to your broadband modem. This doesn't require your computer to be on while making or receiving calls. The most popular application of VoIP works only with an ATA. An ATA converts analog signals to digital signals. Most VoIP service providers include the ATA in their VoIP products, but some require you to buy or rent an ATA.

The other hardware based option is an IP phone, which is similar to a standard telephone but includes an in built ATA adapter. The IP phone is connected directly to the router with a standard RJ-45 Ethernet connector. You can purchase calling cards from your VoIP service provider to start talking through this medium.

VoIP software:- Software-based VoIP works a little differently. VoIP software like Skype, Asterik works through your computer with a microphone, and your computer has to be switched on to receive calls. The most basic VoIP software allows two people with the same installed software to call each other over the Internet. Callers can set up a phone book and can make calls to other users. VoIP services are comparatively cheaper than traditional calls. So, the next time you want to make long distance phone calls or international calls use VoIP.