This is why even though Apple no longer develops iPhoto, some people use it. It can help you easily organize, store and sort images, and even make a slide show to help you enjoy photos.
IPhoto is a photo library familiar to iOS users. However, if you like iPhoto, you can still use it.
Update: On April 8, 2015, Apple has lasunch a new Photos app on OS X Yosemite, which means Apple has stopped developing iPhoto.