This Mac Mini replaced a Windows XP machine when XP came out of support. I thought OS/X was more familiar than XP's replacement.
It is a 2012 third generation model. It has a two core 2.5GHz i5 processor, 4GB of RAM, and a 500GB hard drive.
It has plenty of ports - left to right: power button, mains in, Gigabit Ethernet, FireWire 800, HDMI, Mini-DisplayPort, USB 3.0 ports, SDXC card slot, microphone, headphones.
This version theoretically could be upgraded. The memory used sockets and there was space to add a second hard drive (the server version came with a second drive already fitted).
The front is distinctly minimalist.
This too has now reached the end of support, and so is due for replacement.
