Transitions in PowerPoint 2013
PowerPoint 2013 (from the suite of programs of Office 15) comes with a preset of transitions that we can use between slides.
Transitions can be helpful to add effects between slides. We can apply some nice 3D transitions using the Box or Cube transition. But there are other nice transitions to enhance our presentations for example the Shape transition and Random Bars. These transitions were also available in earlier versions of PowerPoint like in PowerPoint 2010 (as we can see below).
There are other useful articles about transitions like creating custom transitions in PowerPoint.