> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/galera-cluster/galera-architecture.md).

# Galera Architecture

- [Introduction to Galera Architecture](https://mariadb.com/docs/galera-cluster/galera-architecture/introduction-to-galera-architecture.md): Overview of the MariaDB Galera Cluster architecture: the wsrep API, Galera Replication Plugin, group communication framework, and GTIDs enabling synchronous multi-primary replication.
- [Certification-Based Replication](https://mariadb.com/docs/galera-cluster/galera-architecture/certification-based-replication.md): Certification-based replication in Galera Cluster uses optimistic transaction execution, write-set broadcasting, and deterministic certification to keep all nodes synchronized.
- [Quorum Control with Weighted Votes](https://mariadb.com/docs/galera-cluster/galera-architecture/quorum-control-with-weighted-votes.md): Weighted quorum lets each Galera Cluster node carry a vote from 0 to 255, controlling which nodes remain critical for maintaining the Primary Component during failure.
- [Galera Cluster Deployment Variants](https://mariadb.com/docs/galera-cluster/galera-architecture/galera-cluster-deployment-variants.md): MariaDB Galera Cluster supports multiple topologies: standard LAN clusters for high availability, WAN multi-site clusters for disaster recovery, and two-node setups with an arbitrator.