VoIP and video conferencing allow communication over the internet using voice and video. VOIP converts voice into digital data packets that can be transmitted over broadband. It offers lower costs than traditional phone service and mobility since calls can be made from anywhere with an internet connection. Challenges include potential call quality issues if bandwidth is insufficient. Popular VOIP services like Skype allow free video and voice calls but don't provide local phone numbers, while Oovoo supports up to 12 simultaneous callers with features like desktop sharing and file transfer. In conclusion, VOIP, Skype and Oovoo are software alternatives that enable global communication, though their specific features differ.