Final answer:
JPEG is a popular digital photo format because it supports millions of colors and uses compression to reduce file sizes, allowing for efficient storage.
Step-by-step explanation:
JPEG, which stands for Joint Photographic Experts Group, is a widely used file format for digital photos. There are two main reasons the JPEG format is used for digital photos. First, a JPEG is capable of displaying millions of colors, which makes it ideal for rich and detailed photographs. Secondly, JPEGs employ compression to reduce file size without significantly compromising the quality of the image. This efficient compression means you can store more JPEG photos in less space than if they were stored in an uncompressed format.
The file format extensions most commonly associated with JPEG photos is .jpeg