A key vault is a safe place to save sensitive information. When migrating to the cloud, it is critical to maintain security boundaries between different types of sensitive data. The use of numerous vaults to hold this data allows you to conceptually segregate the sensitive data that you are keeping.
Azure Key Vault is a cloud service that safeguards encryption keys as well as secrets such as certificates, connection strings, and passwords. The information saved is sensitive and mission-critical. As a result, secure access to your key vaults is essential, with only approved apps and users permitted.