Galleries are grouped collections of images. You may create multiple galleries to suit your needs.
Images are currently grouped 6-to-a-page, with links to move between pages at the bottom of each page. Galleries with more than 1 image in it will have the Start Slideshow link at the top of each page.
Unlike most other content types, Galleries requires two separate steps:
Step 1: Create the Gallery placeholder
Step 2: Add Gallery Images
Like some other content types, Galleries will not automatically appear on your site pages when you publish them. You will need to link to each Gallery via ?Quick Links or Resources, or other ?Content Types that have link functionality (most often through the Text Editor).