A "4x6 photo" refers to a photograph that measures 4 inches by 6 inches in size. This standard dimension is commonly used for printing pictures, especially for personal memories, such as family gatherings or vacations. The 4x6 format is popular because it fits easily into photo albums and frames, making it convenient for display. In photography, the 4x6 size is often used for both digital and film prints. Many printers and photo labs offer this size as a default option, allowing users to quickly print their favorite images. Additionally, the 4x6 photo format is widely used for invitations, postcards, and other printed materials.