VOIP is an acronym for Voice Over Internet Protocol, or in more common terms phone service over the Internet.
If you have a reasonable quality Internet connection you can get phone service delivered through your Internet connection instead of from your local phone company.

Why is VoIP Better than Standard Phone Services?

Communication over IP network significantly lowers rates of phone calls and is far cheaper as compared with landline calls. Voice over IP technology allows you to make calls through Internet connection and hence it is also a cheaper alternative to traditional phone services for international and long-distance calling, VoIP phone systems will make your monthly phone bills significantly low.