PhotoGrid is a photography application developed by Cheetah Mobile Photo Editor. This application allows you to edit any photographs directly on your Android device.
Once you've installed PhotoGrid, you can use the application by opening up your photographs and editing them with various filters and tools like being able to crop the photos. From there, you can create slideshows using the photos or make memes out of the photos by creating GIFs.
Along with being able to edit your photos, you can use PhotoGrid for videos. PhotoGrid has a built-in video maker in which you can add various effects or trim your videos. You can also easily put multiple videos together into collages that you can then upload to media platforms like YouTube.
Overall, PhotoGrid is very useful for editing photos and videos but it doesn't have that much of a different feature set compared to other editors available for Android.