Bilinear filtering is a technique used in computer graphics to smooth images when they are resized. It works by taking the average of the four nearest pixels surrounding a target pixel, which helps to create a more visually appealing result. This method reduces the blocky appearance that can occur when enlarging images. This filtering technique is commonly used in applications like video games and image editing software. By applying bilinear filtering, images appear less pixelated and more natural, enhancing the overall quality of visual content. It is particularly useful for textures in 3D models and digital photographs.