Skype and VOIP

I have used Skype for both business and personal calls. It has allowed me to have free conversations (including video calls) with my family across the States, and gave me the opportunity to have a free conversation with a graphic designer in Chile. Advantages I have personally experienced with VOIP are the cost efficiency and convenience. However, VOIP doesn't work without Internet, and if the current connection is bad, it can also provide poor audio quality.