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dify-docs/en/features/workflow/key-concept.md

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Key Concept

Node

Nodes are the key components of a workflow. By connecting nodes with different functionalities, a series of operations within the workflow are executed. Nodes are categorized by type:

  • Basic Nodes：Start, End, Answer, LLM, Knowledge Retrieval, Applications (coming soon)
  • Question Understand：Quesition Classifier，Question Rewriting (coming soon), Sub-question Splitting (coming soon)
  • Logic Processing：IF/ELSE, Merge (coming soon), Loop (coming soon)
  • Transformation：Code, Template， Variable Assigner, Function Extraction (coming soon)
  • Others：HTTP Request
  • Tools：Built-in Tools, Custom Tools

Variables

Variables are crucial for linking the input and output of nodes within a workflow, facilitating the implementation of complex processing logic throughout the process.

  • Workflows need to define input variables for initiating execution or conversation.
  • Nodes require input variables for initiation; for instance, the input variable for a question classifier typically consists of the user's question.
  • Variables referenced within a node can only be those from preceding process nodes to ensure coherence and avoid duplication.
  • To prevent variable name duplication, node names must be unique.
  • The output variables of a node are fixed by the system and are not subject to modification.

Differences between Chatflow and Workflow

Application Scenario Differences

  • Chatflow: Targets conversational scenarios and represents an advanced orchestration mode for Chatbot application types.
  • Workflow: Geared towards automation and batch processing scenarios.

Differences in Nodes

Node Chatflow Workflow
Start Utilizes system-built variables for user input and file uploads Utilizes system-built variables for file uploads
End

Not support End node

 Uses an End node to output structured text at the conclusion of execution, which is not designed for mid-process output.
Answer The Answer node is used for streaming output or fixed text replies and can be utilized mid-process. Not support Answer node
LLM Memory is automatically enabled to store and pass on the history of multi-turn dialogues.

Not support Memory configuration
Question Classifier Memory is automatically enabled to store and pass on the history of multi-turn dialogues. Not Support Memory configuration

Application Entry Division

  • Chatflow Entry:
  • Workflow Entry: