Abstract
Over 25 years ago, the Internet was launched by DOD (U.S. Department of Defense) for the purpose of data exchange among 4 super computer centers of ARPA (Advanced Research Projects Agency) located in the USA which is known as ARPANet in 1969. Then ARPANet adopted TCP/IP as its data transferring protocol. Although its specification has been modified and upgraded in lots of part. The Internet is still using TCP/IP as its protocol.
The Internet was restricted for the commercial use for 20 years until we had the first commercial ISP (Internet Service Provider) which was founded in the USA in 1989. In Japan, same as USA we had been restricted until IIJ started its Internet connection service in 1993.
Since the commercial Internet service is available, the number of the Internet users has been growing up rapidly and the same time, so many applications over the Internet have been developed.
In the future, we expect more convenient applications and we expect rapid increase of users accordingly.
