Box art is the artwork on the cover of a video game box, as well as the game logo, the console logo, the rating of the game (such as the ESRB rating), usually the developer/publisher of the selected title, and on many older box arts, the Official Nintendo Seal. The box-art may sometimes be different depending on the region it's released in.
Nintendo Selects were a series of rereleases for games for the Wii, 3DS, and Wii U. They feature red borders and a gold "Nintendo Selects" ribbon near the top of the box.