Apple Photos knows a lot about your photos. It keeps track of the people in your photos, the location, date, time and even what kind of things that can be seen in the images. Photos Tagger extracts the hidden metadata from the Photos database and assign it to your photos as keywords.
Photos Tagger will make it much easier to find and organize your photos. It will make it easier to set up smart albums based on exactly the things you want. And even better, all extracted keywords will be in your language.