ChatGPT's limited knowledge scope to pre-2021 data has prompted the development of LangChain, a tool designed to help users develop language model applications over their own data sources. LangChain aims to simplify the process by providing examples and tutorials for integrating various data sources like Notion, Obsidian, and webpages. In a bid to gather diverse examples, LangChain launched a "Chat-Your-Data" Challenge, encouraging participants to create their own ChatGPT models using personal data sources. Participants are required to customize data sources and prompts using a GitHub repository as a starting point, with optional deployment on platforms like Hugging Face. The challenge not only seeks to expand the repository of examples but also incentivizes participation by offering a limited edition LangChain t-shirt to the winner, determined by the most-starred GitHub repo by February 19th.