How do prospect lists differ from Contacts?

Contacts is the full searchable directory of people who interacted with your agents—leads, customers, and related statuses.

Prospect lists are enrollment pools for LinkedIn message flows. You build them under Prospecting (LinkedIn search, public registry search, CSV, or Sales Navigator), then assign imported lists on a message flow’s Targeting settings. Autotarget lists are filled by agents and are not treated as CSV lists.

See also: Getting the most out of your contact list.