Matched Audiences is LinkedIn's targeting suite for reaching people you already know: website retargeting, contact and company list uploads, and engagement audiences. It brings first-party targeting to LinkedIn's otherwise attribute-based system.
Beyond job-title targeting
LinkedIn's core strength is firmographic targeting, but Matched Audiences adds first-party layers: retarget site visitors via the Insight Tag, upload target-account or contact lists for account-based work, and build audiences from people who engaged with your ads or page.
Where it fits
Contact and company lists power account-based marketing on LinkedIn; retargeting re-engages warm traffic at a lower cost than cold prospecting. As with any list, quality of the ICP input decides the output.