Wikipedia is a free encyclopedia. Ac (short for Academia) is used as a second-level domain for academic institutions such as universities, colleges, and research institutes in various nations. It was first introduced in the 1990s by Network Solutions, who owned the rights to this name since 1995. According to Wikipedia, there are currently AC schools in every continent except Antarctica. The only countries that do not have an AC school are Australia and New Zealand. Both countries have multiple independent university systems with no central governing body or authority. Thus, they would not be able to apply for their own domain name since that would need approval from someone who could make such decisions. Some countries may have AC schools but lack a formal system of universities. For example, Italy has a large number of unisitites all with different names and levels of acceptance. However, there is one institution called Accademia di Musica in Venice which is considered one of the most prestigious music schools in the world. There are also several other musical academies in Italy. All these schools offer degree programs in music performance or music education. They all have official websites but they are not free domains. Instead, they are purchased via the normal process like any other domain name. In fact, many famous musicians acquired their skills by traveling around Europe to study at various music schools.