Getting Down To Work - Microsoft PowerPoint

In the Transitions Tab of the Toolbar, you have options to control how your slides move from one slide to the next during your presentation.  If you click on the different options, your slides will do a quick demo of the transition so you can see if you like it. 

In the Animations Tab of the Toolbar, you have options to control sections of an individual slide.  For example if you had two images on a slide (perhaps a before and after example).  You might want to start with only the first image showing and then have the second comparison image come in after.  Choose one of the Animation effects and set the timing in the Animation Toolbar.  Similar to transitions, you are able to adjust the timing of the effect.

You can test your result by selecting the Preview Tab at the far left of the Animations toolbar.