"Primary conduit" refers to the main channel or pathway through which something flows or is transmitted. It can be seen as the main connection or route that connects two or more entities together. Full definition
Of course, such questions speak to a larger issue: While Facebook has become the public's primary conduit for digital content, its business imperative is to maximize engagement, not objectivity. (cjr.org)
Nintendo spread the news this morning via a Nintendo Direct event, one of the series of virtual press conferences that have become the company's primary conduit for delivering info to its fans. (dailydot.com)
Tillerson's nomination as Washington's chief diplomat and the primary conduit between the US and foreign governments has drawn criticism from those worried about his connections to Russian President Vladimir Putin. (businessinsider.com)