Configuring a category banner image lets you add an image that is relevant to a particular category, so that you can add brand imagery or extend your store's look to individual categories.
To add a category image for an existing page:
Go to Inventory > Categories in your Admin Area.
Hover over the appropriate category and click Edit.
Under Category Images, click Add beneath the Banner Image area.
Click Browse, navigate to the appropriate file on your computer, then click Upload.
For further information, see "How to Use Images to Enhance Category Pages".