That's right, you can put simple little image galleries in pages!
To add an image gallery to an article, here's the format you use:
<gallery> Image:Filename1.jpg Image:Filename2.png Image:Filename3.png|You can even add captions if you want, like this. Image:Filename4.jpg|Your captions can even have [[links]]! Sweet [[Nancy Dye]]! </gallery>
Here's an example using some images:
(For the curious or bored, there's a no-more-informational page at Wikipedia about this, too.)