From Support

Widgets are the basic building-blocks of your site. Widgets must be placed into Widget Boxes, and up to two Widgets can be placed side-by-side. The following types are available, (in alphabetical order):

• Header - Much like the Text Widget, but with a larger font size. This is used to create distinct sections on your site. You cannot insert photos into a Header like you can for normal Text.
• Photo Gallery - Simply draws all of your uploaded photos to the page. The order of the photos is determined by the Photo Manager.
• Slideshow - Draws the slideshow to your page. It pulls its list of images from the Photo Manager. (Site->Photos).
• Text - The most fundamental of them all! This is where you can type free-form content for your site. You can insert images, and style text with bold/italic/underline. This has a half-size equivalent.