The Internet originated in the 1960s from the visionary ideas of researchers who wanted to enable computers to share information. J.C.R. Licklider first proposed a global network in 1962. In 1965, Lawrence Roberts connected two computers over telephone lines, confirming Kleinrock's theory of packet switching. Four computers were connected as ARPANET in 1969 under a DARPA contract, and it continued expanding to include more universities and research organizations. The TCP/IP protocols developed in the 1970s established the Internet's architecture. In the 1980s, NSFNet provided a national backbone and popularized email, FTP, and other services for non-technical users.