Data enrichment is the process of enhancing existing contact or account data with additional information, allowing marketing teams to better understand their customers and prospects, target them more effectively, and deliver successful campaigns. With third-party data enrichment providers like Apollo.io, Clearbit, ZoomInfo, PeopleDataLabs, and InsideView, marketers can automatically enrich their data without manually collecting it, reducing costs and increasing efficiency. By leveraging enriched data, marketing teams can implement various use cases such as personalization, behavioral targeting, lookalike modeling, social media targeting, predictive lead scoring, and geotargeting to drive higher conversion rates and gain a competitive advantage in the market.