Data Bridge is a HubSpot extension that lets users display external content directly within CRM records. It supports embedding images, Google Sheets, dashboards, videos, Microsoft Office files, and other web-based assets in contact, company, and deal views. It works through a custom card in HubSpot, allowing users to access and manage external resources without leaving the CRM. The goal is to make relevant information available in one place and reduce the need to switch between tools.