Is there an app you can make a 'movie' with?

I'm going to Ireland in a few days and I have a reay cute idea for my cousin who couldn't make it. I want to take a bunch of video clips on my iPhone and then join them together so it's like a movie! Please tell me, is there an app in the App Store I can do this with? Than you!

IMovie made by apple it is amazing and easy to use.