Computer technologies are
the base for how computers advance to what we know today. I grew up with the beginning of home computers, before that there were only huge computers for organizations purposes which were filling up a whole room, only for that computer server. It had its own air condition, to prevent it from heating up and breaking down.
Those huge servers were huge and if we compare their performance, it was so slow in comparison to our home computer (which are much faster), but then with the technologies that were in those days, those large computers were a breakthrough. They were advancing and improving, and eventually, the technologies enabled them to reduce the size, become more efficient, faster, until we were able to get them into our homes. Technologies were advancing and improving, and as they 
became more efficient, the cost of them has reduced as well, so the cost became profitable for home use. Before that, the cost of huge servers was very expensive.
Computer technologies, what are they ?, Well they are what makes the computer what it is. There are technologies that relate to the computer box (from heavy IRON to light ALUMINUM), motherboard, the CPU (getting smaller and faster, as the technology-enabled miniaturizing). The wireless technology enabled us to lose computer wires. There are many other technologies that effected the way comp
uters work and look today.
We almost forgot where we were 20 years ago, there where 1.2MB flexible floppy diskettes, then we got the 1.44MB plastic-covered floppy diskettes. Hard disks were very small (20Mb, 40Mb), and for programming, we had to use any available resource just to compile our programming sources, so we created virtual flash drives, just to accelerate the compilation process (using the hard disk to compile the sources was too slow). These examples can just show you how advanced we are today from 20 years ago.
I believe computer technologies were advancing a lot quicker than other technological areas. If we look at what we achieved in the last 20 years, and where we are today, as everything becomes smaller and smaller, we can appreciate how much computer technologies advanced since
then.