To help those who don't understand the technology
A "server" is normally a large more powerful computer used as a "central" computer by a company or organization. An "i7" relates to the power of the Intel CPU (Central processing Unit).
All computers, tablets and phones have a CPU (the "brain" of the device as some people label it) and an Intel i7 is one of their more powerful CPUs.
The OS (Operating System) is the software that runs the computer. Many of us use an OS of Windows on our computers, and maybe Android on our phones, but there are dozens of different operating systems (such as Linux, Mac OS, iOS etc).
A HDD is a Hard Disk Drive that is used to store all the data on a computer. It has spinning "disks" so has moveable parts and in the worst case can "crash", losing all the data (however that rarely happens).
An SSD is a Solid State Drive that can also be used to store all the data on a computer but it has no moving parts so cant "crash".
These are already used in tablets and smartphones (which is how they can be so small) and on "SD Cards" (or similar) used in cameras and other devices, but gradually they are being used more and more in computers as they are quicker and quieter than HDDs.
They also use less power (hence the eco friendly).