OpenCV, or Open Source Computer Vision Library, is an open-source computer vision and machine learning software library. It provides a wide range of tools and functions for image and video processing, including features such as object detection, facial recognition, image stitching, and more. OpenCV supports multiple programming languages, making it accessible to developers using C++, Python, and Java, among others. Its versatility and extensive collection of algorithms make it a popular choice for applications in fields like robotics, augmented reality, and computer vision research. Overall, OpenCV simplifies the development of computer vision applications by offering a comprehensive set of tools and a supportive community.