Every photo you take with your iPhone has associated data that you can view such as the time and date, location, camera information and more. You can also add titles, descriptions and keywords to your photos which makes them a lot easier to find with the search function. While Apple is always improving its photo search function, there always seem to be photos that are missed when you search for a keyword.
Every photo you take with your iPhone has metadata attached to it - information about the photo like what camera it was taken with, the coordinates where it was taken, date, time and more. You can add data as well, including a title, description and keywords to facilitate search results. The Photos app is able to detect faces, and if there are any faces in a photo that you have assigned names to, and the app recognizes them, then those names will be in the metadata as well.
The Photos app is seemingly improved with each new iOS, and this holds true with iOS 12 as well. In addition to improving the search function (allowing you to search by place or event and multiple keywords), allowing for editing RAW files, and an overhauled Albums layout, Photos in iOS 12 adds a For You tab that includes a number of features. Here's an overview of the new For You section:
iOS devices offer a quick way to hide specific pictures in the Photos app. Hiding photos simply places them into a Hidden album, and removes the images from elsewhere in the photo library. While this provides iPhone, iPad and iPod touch users with an easy method of hiding pictures on the Camera Roll or another album, these images can be viewed directly in the Hidden album at any time.
Those who are signed up for Apple's Beta Software Program and testing iOS 12 may have noticed that it offers a new way to share photos - by sharing a direct link to your iCloud Photos that will last for 30 days. Not all features found in beta make it to the official iOS, but hopefully this one will, as it pretty useful for sending multiple photos. Instead of actually attaching each photo to an email or sending them in Messages, you are merely posting a link.