VideoBite is a free iOS app from Adobe that lets you edit video or create slideshows with titles, transitions and music. The app is hardly alone in the video-editing space, but an Adobe app is always worthy of some attention. To a degree, the app is a Trojan horse to sell Adobe's Revel service, which is US$5.99 a month, although it is not required to use this app. Revel is cloud-based, and lets you share photos and videos to any computer or iOS device. Bypassing that, videos can be saved to your camera roll, and shared via email, text or uploaded to Facebook or YouTube.
The app asks for access to your camera roll. You can add clips, edit them and assign transitions; you can also create a title and end card, and select music, either tunes that are on your iPhone or music supplied by the app.
Putting together a movie is easy enough. You can trim the clips, and assemble them into a movie. There is a quick help feature, but I think most people won't need it. The app also provides a feature called "Looks," which is basically a set of filters that change the color, saturation and contrast over your video.