# Customer Success **Customer success (CS)** is the discipline of proactively ensuring customers achieve their desired outcomes with your product. It's the function that owns post-sale relationship health, retention, and expansion. ## CS vs support vs sales - **Sales** — sells the product - **Support** — reactively resolves tickets - **Success** — proactively drives outcomes - **Operations** — the underlying workflow plumbing that lets all three function ## CS team responsibilities - Onboarding new customers - Running QBRs and EBRs - Tracking customer health - Identifying expansion opportunities - Renewing contracts - Acting as the voice of customer back to product ## Metrics CS owns NRR, GRR, churn rate, expansion rate, time-to-value, NPS/CSAT, customer health score, renewal forecast accuracy. ## How BlueHill helps CS teams Status reports, interaction timelines, customer health views, and onboarding templates give CSMs the operational picture they need without spending half their day in spreadsheets. Related: [Customer operations](/what-is-customer-operations) · [QBR](/glossary/qbr) · [NRR](/glossary/nrr) · [Churn](/glossary/churn)