One of the key value propositions of LangChain is its ability to combine Large Language Models with user-provided text data, and this can be achieved through multiple methods. To get this text data into a usable format, unstructured.io provides an open-source Python package that supports various file extensions, including documents, images, emails, and presentations. By integrating with Unstructured, LangChain developed the Document Loaders module, which powers two loaders: the UnstructuredFileLoader and the DirectoryLoader. These loaders simplify the process of loading data into a format compatible with LangChain's language models, making it easy to combine language models with user-provided data regardless of its original form.