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> **Documentation Index:** Fetch the complete configuration index at https://ydb.tech/docs/en/llms.txt

# Concepts YDB

This documentation section covers the fundamental concepts and architectural principles of YDB. This information will help you better understand what happens when you study more practical content that can be found in [other sections designed for specific roles](#see-also).

The following topics provide comprehensive coverage of the core functionality of YDB, from high-level architecture and data model to advanced capabilities such as transactions, indexing, and federated queries.

- [Glossary](https://ydb.tech/docs/en/concepts/glossary.md)
- [Analytical capabilities](https://ydb.tech/docs/en/concepts/analytics/index.md)
- [Stream processing](https://ydb.tech/docs/en/concepts/streaming-query/index.md)
- [Architecture](https://ydb.tech/docs/en/concepts/architecture.md)
- [Connecting to a database](https://ydb.tech/docs/en/concepts/connect.md)
- [Schema objects](https://ydb.tech/docs/en/concepts/datamodel/index.md)
- [Cluster topology](https://ydb.tech/docs/en/concepts/topology.md)
- [Query execution](https://ydb.tech/docs/en/concepts/query_execution/index.md)
- [Transactions](https://ydb.tech/docs/en/concepts/transactions.md)
- [Change Data Capture (CDC)](https://ydb.tech/docs/en/concepts/cdc.md)
- [Time to Live (TTL) and data eviction to external storage](https://ydb.tech/docs/en/concepts/ttl.md)
- [Database limitations](https://ydb.tech/docs/en/concepts/limits-ydb.md)
- [Asynchronous replication](https://ydb.tech/docs/en/concepts/async-replication.md)
- [Bridge mode](https://ydb.tech/docs/en/concepts/bridge.md)
- [Data transfer](https://ydb.tech/docs/en/concepts/transfer.md)

## See also {#see-also}

- [YDB for DevOps Engineers](https://ydb.tech/docs/en/devops/index.md)
- [YDB for Application Developers / Software Engineers](https://ydb.tech/docs/en/dev/index.md)
- [YDB for Security Engineers](https://ydb.tech/docs/en/security/index.md)