The Table API for Cosmos DB uses Azure Tables that are present in Azure Storage Services, but adds a couple of extra features and functionality on top of them
| Azure Tables | Cosmos DB |
|---|---|
| Fast, no upper bound on latency | Single digit latency |
| Variable throughput limited to 20,000 operation/s | Guaranteed backed by SLA. No upper limit on throughput |
| Single region | 30+ regions |
| Only Primary index | Automatic and complete indexing on all properties |