If you’re posting jpgs to a website, this utility could help reduce the size of the files without impacting their visual quality.
Basically, it strips out any non-image related items from the jpg like EXIF, comments etc. DO NOT do this to your original images from your camera as you will likely want to keep the EXIF info.
Try it on a few images and see if it helps. In my case, it would only save 31 bytes/image since the program I use for generating my images already strips out most of the information