Galleries
Featured Gallery Widget
With this you can highlight a number of images or Youtube videos on your site.
Especially if you wish to add notes or commentary on the images (which is optional).
Using WordPress' media gallery
Another way to create a gallery on a page is to use the "Add Media" option in the editor and select a number of images.
This is useful if you just want to show a number of pictures without commentary (ie. from an event).