In cloud computing, Key Management Service (KMS) is a managed service that provides centralized control over encryption keys used to protect data. KMS allows users to create, import, rotate, and delete cryptographic keys securely. When data is encrypted, KMS handles the encryption key management process, ensuring that keys are stored securely and are only accessible to authorized users. This service simplifies the process of key management, enhances security, and helps comply with various data protection regulations. For instance, AWS KMS is a popular KMS service provided by Amazon Web Services that integrates with other AWS services to secure data.