> For the complete documentation index, see [llms.txt](https://docs.glik.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction.md).

# Input & Extraction

- [Doc Extractor](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/doc-extractor.md)
- [Knowledge Retrieval](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/knowledge-retrieval.md)
- [LLM Block](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/llm-block.md)
- [LLM Reasoning](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/llm-block/llm-reasoning.md): Enables adaptive decision-making, reduces manual review, and adds explainability to enterprise workflows.
- [Fallback to LLM Reasoning](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/llm-block/fallback-to-llm-reasoning.md): Fallback to LLM Reasoning provides resilience and human-like adaptability in GLIK workflows. It ensures continuity, captures contextual judgment, and keeps workflows flexible when predefined logic is
- [Tool Node](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/tool-node.md)
- [Agent](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/agent.md)
- [Answer](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/answer.md)


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