Cloud secrets management is the practice of securely storing, accessing, rotating, and governing sensitive credentials like API keys, passwords, database credentials, and certificates across cloud environments. As organizations adopt multi-cloud architectures and microservices, the number of secrets proliferates exponentially—creating what's known as secret sprawl. Modern secrets managers solve this by centralizing storage with encryption at rest and in transit, automating credential rotation to reduce exposure windows, enforcing least-privilege access through fine-grained policies, and providing comprehensive audit trails for compliance. Understanding the differences between AWS Secrets Manager, Azure Key Vault, Google Secret Manager, and HashiCorp Vault—and when to use dynamic versus static secrets—is critical for building secure, scalable cloud infrastructure.