# Indexer Infrastructure

- [Blockchain Node](/indexerdao/indexer-technical-stack/indexer-infrastructure/blockchain-node.md): Participant in the blockchain network that stores a copy of the blockchain and validates transactions. Nodes can be run by anyone and can be used to interact with the network
- [Indexer Agent](/indexerdao/indexer-technical-stack/indexer-infrastructure/indexer-agent.md)
- [PostgreSQL](/indexerdao/indexer-technical-stack/indexer-infrastructure/postgresql.md)
- [Indexer Data](/indexerdao/indexer-technical-stack/indexer-infrastructure/postgresql/indexer-data.md)
- [Subgraph Data](/indexerdao/indexer-technical-stack/indexer-infrastructure/postgresql/subgraph-data.md)
- [Graph Node](/indexerdao/indexer-technical-stack/indexer-infrastructure/graph-node.md): Also called Indexer Node
- [Index Node](/indexerdao/indexer-technical-stack/indexer-infrastructure/graph-node/index-node.md)
- [Query Node](/indexerdao/indexer-technical-stack/indexer-infrastructure/graph-node/query-node.md)
- [Indexer Service](/indexerdao/indexer-technical-stack/indexer-infrastructure/indexer-service.md)
