The Mac Mini is not one of Apple's highest-volume computers in terms of sales, but it is an important slot in Apple's lineup, especially for people who make apps for iPhones and other Apple platforms. Many iPhone developers like to run a Mac Mini as a personal development server for coordinating uploads and code.
One improvement in the new design is that all of the ports are USB-C ports, the same more modern offering found on Apple's laptops. There are three USB-C ports on the rear and two on the front, a new addition that will make it easier to plug or unplug accessories while the computer rests on a desk.