Apollo.io is a provider of sales engagement and lead generation software that helps businesses find and connect with potential customers. The company's products include Apollo Prospector, which uses artificial intelligence to identify and prioritize leads based on a company's ideal customer profile; Apollo Outreach, which automates the process of sending personalized emails and follow-up messages to prospects; and Apollo X, which provides real-time insights into sales performance and customer engagement. Apollo.io's customers include some of the world's largest companies in industries such as finance, healthcare, and e-commerce.