Homography is a mathematical concept used in computer vision and image processing to describe the relationship between two images of the same scene taken from different viewpoints. It represents a transformation that maps points in one image to corresponding points in another, allowing for tasks like image stitching and perspective correction. In practical applications, homography is often used to align images or to create panoramic views by stitching multiple images together. It can also help in object recognition and tracking by enabling the comparison of images taken from various angles, ensuring that the objects appear consistent across different perspectives.