Apollo.io is a B2B sales intelligence and engagement platform with a database of over 270 million contacts and 60 million companies that helps sales teams find, engage, and close prospects at scale. Its AI enriches contact records, scores leads based on likelihood to convert, and powers automated multi-touch outreach sequences combining email, phone, and LinkedIn. Revenue teams at high-growth companies use Apollo to replace fragmented point solutions with a single platform covering prospecting, enrichment, sequencing, and analytics for the entire outbound sales process.