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# Models

Note

Conceptual Guide

This section of the documentation deals with different types of models that are used in LangChain. On this page we will go over the model types at a high level, but we have individual pages for each model type. The pages contain more detailed “how-to” guides for working with that model, as well as a list of different model providers.

LLMs

Large Language Models (LLMs) are the first type of models we cover. These models take a text string as input, and return a text string as output.

Chat Models

Chat Models are the second type of models we cover. These models are usually backed by a language model, but their APIs are more structured. Specifically, these models take a list of Chat Messages as input, and return a Chat Message.

Text Embedding Models

The third type of models we cover are text embedding models. These models take text as input and return a list of floats.

## Go Deeper

- LLMs
- Chat Models
- Text Embedding Models