Final answer:
VoIP (Voice over Internet Protocol) is the term for the capability to make phone calls via the internet from computers or PDAs, and it has contributed to cheaper, more accessible, and higher quality communication.
Step-by-step explanation:
The term that refers to the capability of making phone calls from your personal computer or PDA using the internet is VoIP (Voice over Internet Protocol). VoIP technology has grown significantly due to various improvements in technology, such as microwave transmission, communications satellites, and other wireless technologies. This advancement has led to more consumer choice, cheaper phone calls, especially long-distance, and often a better-quality phone service. Furthermore, VoIP is part of a broader movement in telecommunications, contributing to cheaper, faster, and better-quality data transmission, and has enabled spin-off technologies like free Internet-based calling and video calling that have become commonplace in personal and professional communication.