Customer success is a business function aimed at helping customers achieve their goals sustainably. This function ensures that all of the interactions customers have with your brand holistically contribute to their organization's overall growth and success. Customer success is very much relationship-focused -- with every customer success manager responsible for a specific number of clients, ensuring they derive maximum value from the product or service. The term customer success first originated in the '90s but has gained greater traction over the past decade, especially in the world of SaaS.