# ARPANET **Domain:** Computer Networks / Research Infrastructure **Doc Type:** Historical Infrastructure Node **Maturity:** Foundational ## Definition **ARPANET** was the packet-switched research network funded by ARPA that connected university and research computers and became a principal ancestor of the Internet. ## Historical Context The first host-to-host message was transmitted in October 1969. Its proximity to the calendar boundary used to define the 1970s illustrates how technical lineages pass through historical periods without observing their narrative divisions. ## Corpus Context [[articles/Modern Artificial Intelligence in the 1970s|Modern Artificial Intelligence in the 1970s]] invokes ARPANET as part of its critique of [[wiki/Periodization|periodization]], not as a neural-network development. ## See Also [[wiki/DARPA|ARPA/DARPA]], [[wiki/Lawrence Roberts|Lawrence Roberts]], [[wiki/Internet|Internet]]