A Laplacian Filter is a type of image processing technique used to enhance edges in images. It works by calculating the second derivative of the image intensity, highlighting areas where there is a rapid change in pixel values. This makes it effective for detecting edges and fine details. The filter is typically applied to grayscale images and can be implemented using a convolution operation with a specific kernel. The result is an image that emphasizes edges, making it useful in various applications such as computer vision, image segmentation, and feature extraction.