: A number in parentheses or an underscore followed by a number often indicates a duplicate file that was renamed to avoid overwriting an original file with the same name.
If this file appeared in a downloaded folder (such as from Google Takeout or a backup): 1_125.jpeg
: Some cameras or automated processing scripts rename files based on their metadata (EXIF data) to help photographers sort images by settings. 2. Standard JPEG File Format : A number in parentheses or an underscore
: It is the most common format for digital photos because it balances high visual quality with small file sizes. 1_125.jpeg