VoIP has become a popular communication method due to its cost-efficiency and versatility. 

• Digital Communication: VoIP converts voice into digital packets and transmits them over the internet. On reaching the destination, these packets are converted back into voice audio.

• Use of Internet: Unlike traditional telephony that uses dedicated voice networks, VoIP uses the public internet or private data network lines for voice communication.

• Cost-Effective: VoIP can significantly reduce communication costs, especially for long-distance and international calls, as it bypasses traditional phone service providers and their charges.

• Hardware and Software Options: VoIP calls can be made from computers using VoIP software, traditional phones with VoIP adapters, or dedicated VoIP phones.

• Advanced Features: VoIP services often include features like voicemail, call forwarding, call waiting, caller ID, and three-way calling, usually at no extra cost. Many also offer advanced functionalities like video calls, text messaging, and file sharing.

• Portability: VoIP phone numbers, often called "virtual numbers," can be used anywhere there's a high-speed internet connection, allowing users to make and receive calls from any location.

VoIP technology has revolutionized telecommunications, offering flexibility, a wealth of features, and cost savings over traditional phone lines, making it a preferred choice for both personal and business communications.