Photo filters are digital tools used to alter the appearance of images. They can enhance colors, adjust brightness, or add special effects, making photos more visually appealing. Many photo editing apps and social media platforms, like Instagram and Snapchat, offer a variety of filters that users can apply with just a tap. These filters work by changing the pixels in a photo, allowing for creative expression and personalization. Some filters mimic traditional photography techniques, while others create unique artistic styles. Overall, photo filters are a popular way to enhance images and share moments in a visually striking manner.