You choose where to put thumbnail galleries. You decide
the number of pictures in a gallery and the size of the thumbnails.
When a visitor clicks on a thumbnail, the template's
SHOWPIC.HTML file will display a popup that is automatically
adjusted to fit the picture and the limits of the visitor's
screen.
You choose where to put slide shows. You decide the number
and size of the pictures as well as the speed at which they're
shown.
You might find this useful for displaying a particular group
of featured products. If you run a nonprofit organization, you might
want to show group photos, etc.