FedRAMP is a mandatory authorization framework for cloud service providers (CSPs) selling to U.S. federal agencies. It enforces security controls aligned with NIST SP 800-53, requires continuous monitoring, and mandates third-party annual assessments. An organization seeking federal customers must either achieve FedRAMP ATO (Authority to Operate) or use a FedRAMP-authorized CSP. The certification applies to the service itself, not individual deployments. Once authorized at Moderate or High impact level, the service can be purchased by any federal agency at that level or below. Agencies still conduct their own risk assessments but significantly reduce due diligence effort.