Azure Cosmos DB is a globally distributed, multi-model database service provided by Microsoft Azure. It is designed for building highly responsive and scalable applications that require low-latency access to data. here are the key aspects of Azure Cosmos DB pricing:

1. Performance Level: Azure Cosmos DB offers different performance levels, including provisioned throughput (fixed RUs per second) and serverless (pay-per-request). The choice of performance level significantly impacts pricing. Provisioned throughput is suitable for applications with predictable workloads, while serverless is designed for sporadic or variable workloads.

2. Request Units (RUs): Request units (RUs) are a measure of the database’s capacity to handle read and write operations. You need to provision a specific number of RUs to meet your application’s performance requirements. The more RUs you provision, the higher the cost. The specific pricing per RU depends on your chosen region and the performance level.

3. Data Storage: Azure Cosmos DB charges for data storage based on the amount of data stored in your containers. This includes both the user data and the system overhead. You pay for the provisioned storage capacity, which is measured in gigabytes (GB).

4. Data Transfer: Data transfer costs apply when you transfer data in and out of Azure Cosmos DB. The cost varies depending on the volume of data transferred and the destination (e.g., within the same region or across regions).

5. Global Distribution: If you replicate your data across multiple Azure regions for high availability and low-latency access, there may be additional costs associated with data replication and egress.

6. Backup and Restore: Azure Cosmos DB includes automated backups, and you may incur costs if you need to restore data from backups.

7. Change Feed: If you use the change feed feature to track changes to data, there may be additional charges associated with reading the change feed.

8. Multi-region Writes: If you enable multi-region writes for global distribution, additional costs may apply based on the regions where writes occur.