DataChain is a contemporary Python data frame library tailored for artificial intelligence. It is designed to organize unstructured data into datasets and process data at scale on local machines. DataChain does not abstract or hide AI models and API calls but facilitates their integration into modern data stacks. The product's main advantages include its efficiency, ease of use, and powerful data processing capabilities, supporting a variety of data storage and processing methods, including images, videos, text, and more, while seamlessly interfacing with deep learning frameworks like PyTorch and TensorFlow. DataChain is open-source and follows the Apache-2.0 license, making it freely available for users.