The graphics used in interfaces keep evolving as technology becomes better and more efficient at showing colours and pixels. This of course means that interfaces never used to include graphics or symbols. With the introduction of screens in electronics, interfaces were basic and hardware was only just powerful enough to output 2-colour text...
Screen shot of the DOS Terminal in Windows XP
The Command-Line Interface (CLI) was a basic way of showing what you input to a computer and what the computer is doing. It was when computers got powerful enough to display graphics and colours where the interface of a computer really attributed to the PC 'boom' in the 1990s...
A modern colour-rich, high resolution theme in Windows XP
The Graphical User Interface (GUI) really took off on every electronic screen interface when it was introduced to the PC. The GUI made previously difficult interfaces simple to use for the user, and so more and more people considered using products that featured them.
GUIs are also continuing to evolve, now often featuring animation and 3D, as backgrounds or even as just the icons. GUIs will continue to evolve at the pace that hardware evolves, so that as components get more powerful, users will not have to sacrifice speed in order to get a graphically-rich interface.
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