The term "4x5" typically refers to a photographic format that measures 4 inches by 5 inches. This size is commonly used in large format photography, allowing for high-resolution images and detailed prints. Photographers often use large format cameras to capture landscapes, portraits, and other subjects with exceptional clarity. In addition to photography, "4x5" can also describe a mathematical expression, where 4 is multiplied by 5, resulting in 20. This basic arithmetic operation is foundational in mathematics and is often taught in early education. Understanding multiplication is essential for various applications in everyday life and advanced math.