Customer Success Platforms in the Sales context provide account managers and post-sale reps with customer health visibility, renewal pipeline tracking, and expansion signal detection — ensuring revenue retention and growth from the existing customer base. Core capabilities include customer health scoring, renewal forecasting, expansion opportunity identification, CSM task and playbook management, stakeholder mapping, and integration with CRM, product analytics, and support systems. The category spans the same platforms as Customer Success dept (Gainsight, ChurnZero, Totango, Vitally) but classified here when purchased by Sales leadership for revenue retention.