Apple’s Photos app on the Mac and iOS can identify thousands of different objects in your photos, so it’s easy to find photos based on their content. You can find objects (cars, trains, dogs, food), scenery (beaches and forests), and even some events (weddings and parades). This is both big fun and useful for those times when you can’t remember when you took a photo, but do remember what’s in it, like a cat, camera, or carousel. To carry out a search like this, type the search term into the Search field on the right side of the Photos toolbar on your Mac or click the Magnifying glass near the top of your screen in Photos for iPhone or iPad. From the list that appears, choose the Category result. In macOS 10.13 High Sierra’s version of Photos, you can filter your results from the Showing menu at the upper right of the window. The feature isn’t perfect, so you may see some odd results or miss some photos, but it’s way faster than browsing manually!
You can also ask Siri on your iPhone, iPad, or Mac to “Show me pictures I took of sunsets.”
These searches are the result of machine learning performed on your own device. Apple isn’t analyzing your photos in the cloud.