Modern AI is moving beyond traditional machine learning models, requiring more sophisticated frameworks that can perform complex inferences on extensive datasets. However, as model complexity increases, so does the need for interoperability among multiple frameworks used to build, test, and deploy AI systems. The Open Neural Network Exchange (ONNX) framework addresses this challenge by offering a standardized, open-source format for representing AI models, allowing developers to seamlessly integrate AI tools with existing tech stacks. ONNX provides key features such as open-source support, standardized format, conversion tools, visualization and optimization libraries, interoperability, focus on inference, format flexibility, performance optimizations, and compatibility with popular frameworks like PyTorch, TensorFlow, Scikit-Learn, Keras, Microsoft Cognitive Toolkit (CNTK). It also offers pre-built conversion libraries to simplify the process of converting models from various frameworks to ONNX. With ONNX, developers can build, share, and run models across multiple platforms without worrying about compatibility issues, thereby streamlining the entire model development and deployment lifecycle.