# Related Services

Table 1 Related services
Function | Related Service | Reference
--- | --- | ---

IAM provides the following functions:

- User identity authentication
- IAM user permission management
- IAM agency configuration

Identity and Access Management (IAM)

Permissions Management

Configuring User Permissions

CTS collects records of operations on OBS resources, facilitating querying, audits, and backtracking. | Cloud Trace Service (CTS) | Cloud Trace Service
SMN sends OBS related alarms and event notifications, and triggers workflows. | Simple Message Notification (SMN) | SMN-Enabled Event Notification
Tags are used to label and classify buckets in OBS. | Tag Management Service (TMS) | Tag Overview
KMS encrypts files uploaded to the OBS. | Key Management Service (KMS) | Server-Side Encryption Overview
DNS resolves domain names configured for static website hosting in OBS. | Domain Name Service (DNS) | Using a User-Defined Domain Name to Configure Static Website Hosting

The OBS can serve as a storage resource pool for other cloud services such as Relational Database Service (RDS) and Cloud Trace Service (CTS).

Parent topic: Service Overview