Aside from a redesign that shrunk the case and reduced the computer's volume in half, the main upgrade on these new computers is that they include Apple's latest chip, either the M4, or a more powerful version called the M4 Pro.
The Mac Mini is Apple's least-expensive Mac, starting at $599, and does not include a display, which is sold separately. When the product line was first introduced in 2008, it was marketed as a computer for people switching from Microsoft Windows who could simply plug their existing keyboard, mouse and monitor into their new silver box.