What your photos reveal
Every phone and camera writes metadata into the photo file: the exact GPS position, the date and time, the device model, sometimes the owner name and the editing software. A photo of something you sell online can show where you live; a picture sent to a stranger can tell them where you were.
This tool lists what it finds in each file, then removes the information blocks from the file itself. The image data is copied byte for byte, so quality and file content stay exactly the same, unlike tools that re-save the picture.
What is kept
The color profile is kept so colors look the same. If the photo was taken sideways, a tiny orientation note is written back so it is not shown rotated. Everything else, including camera details, dates, location, XMP, IPTC and hidden extras appended to the file, is removed.