It is compatible with a range of Android devices such as smartphones and tablets.
It is compatible with a range of iOS devices such as iPhones, iPads and the iPod Touch.
This can be used to rotate the image for an interesting effect, or more commonly to correct the image if it is at a slight angle.
You can take photos within the app. This allows you to do everything from capturing the image to editing all within one app, instead of having to import an image taken with another camera application.
Filters allow you to apply effects to your image with one touch, usually with a range of effects such as retro films or sketches.
You can tag your photos/videos at the specific location where you took them. This gives you another way to organise them, and also makes them more discoverable by other people.