The modern postal mail service adopted the notion of universal delivery and made it available to all.
Any individual can send a letter to any other individual.
The telegraph changed the basic communication infrastructure because it introduced high-speed message delivery. Telephone Telephones changed the communication infrastructure by extending communication services to individual homes and offices, and by providing the instantaneous communication needed for interactive conversations. The Internet Was Designed To Be General Because the basic Internet communication facilities are both general-purpose and efficient, almost any network application can use the Internet. The Internet offers a wide variety of services. Most of the services currently available had not been invented when the Internet was designed.