BROWSER: The Browser Module is where you get access to your files, with tools to search and sort. It also displays basic metadata for a selected file. Browser also integrates with cloud storage services like Dropbox, Google Drive and iCloud Photo Stream for direct access to those files—very handy if you use those services.
LAYERS: This Module lets you work with multiple layers, either copies of the same photo or for compositing multiple images. The Layers workspace has tools to crop, mask and retouch, along with layer blending controls.
ENHANCE: In the Enhance workspace (shown here), you have access to a variety of preset effects in the left sidebar, and controls to refine those effects or create your own. This Module is where you'll probably spend most of your time.
PORTRAIT: Open a portrait in the Portrait Module, and it automatically detects faces in the scene, and specific facial features to enhance (you can manually add faces it doesn't detect). Tools are available to retouch skin, whiten eyes and teeth, and correct color tones.
EFFECTS: Here, you'll find lots of additional effects you can apply to a photo: vignettes, borders and more wild visual effects to achieve a particular aesthetic. Each effect is applied on its own layer so you have blending controls to fine-tune the results.
B&W: This Module makes conversion to black-and-white as easy or as detailed as you'd like. You can apply numerous presets, or use slider controls to control every aspect of the conversion. There are also brushes that let you paint contrast, brightness and other refinements to select areas of your photo.
MASK: Use the Mask Module when you want to knock out a subject from its background. Paint over objects you want to remove (the sky, for example), and Mask analyzes the color data and removes just that area. Another brush lets you refine the edge. Mask does all of the heavy-lifting.
RESIZE: Need a larger file for printing? Use Resize to enlarge older, lower-resolution digital photos, or blow up a favorite image for poster-sized printing. You can control grain and sharpness, and even create a "gallery wrap" with borders for printing to a wrapped canvas.