Sources let you pull live data into Clay. There are three main types of sources: webhooks, direct integrations, and CSV imports.
Direct integrations: Clay's library of source integrations allows you to pull directly from your tooling with a simple OAuth, for example querying data from Linkedin, or streaming in contacts from your HubSpot:
Note that sources are built to feed your table live data, meaning that they pull in new data on a schedule (soon to be configurable!).