Signal-based selling is outbound built around a real reason to reach out, a buying signal, instead of a static list of job titles.
The bet is timing. A prospect who just raised, switched tools, or hired for a gap is far likelier to answer than the same person contacted at random. The mistake is treating signal-based as a data badge while still blasting the whole list the same week. The signal only helps if the message and the timing actually change because of it.
Related Buying signal, Spray-and-pray, Trigger-based outbound