cognee is an open-source, scalable data layer designed specifically for AI applications, providing modular ECL pipelines to interconnect and retrieve past conversations, documents, and audio transcriptions while reducing hallucinations, developer effort, and cost. It uses graphs as a semantic layer to allow LLMs to reason better and understand their working context, supporting multiple storage solutions for both vector and graph data. cognee simplifies the data engineering process by providing a reliable and flexible framework to create semantic layers, making it ideal for developers who need a reliable data layer for AI applications.