Multithreading is the practice of building relationships with several stakeholders inside a single target account, rather than relying on one contact. If your champion goes quiet or leaves, the deal does not collapse, because you have more than one way in.
Single-threaded deals are fragile: one departure, reorg, or silent stakeholder can end them. Modern buying committees involve many people, so reaching several of them protects the deal and reflects how decisions actually get made.
The hard part of multithreading is getting a credible first conversation with each stakeholder. A warm path to each one, surfaced through pathfinding, means every thread starts warm instead of cold. See how teams multithread deals with warm paths.
Via helps you multithread without going cold on the extra contacts. For each stakeholder in an account, it surfaces a warm path in, so you can build several threads that all start from trust rather than a cold message.