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Modules

LangChain provides standard, extendable interfaces and external integrations for the following modules, listed from least to most complex:

Model I/O​

Interface with language models

Data connection​

Interface with application-specific data

Chains​

Construct sequences of calls

Agents​

Let chains choose which tools to use given high-level directives

Memory​

Persist application state between runs of a chain

Callbacks​

Log and stream intermediate steps of any chain

Experimental​

Experimental modules whose abstractions have not fully settled