A technology aesthetic is a design that celebrates the limitations of the medium.
where is it used?
It's most commonly used in games. A 2D platformer might deliberately used pixelated visuals, even when the monitor is capable of a higher resolution.
can you give some examples?
In gaming, minecraft is a great example of a project choosing a specific voxel look rather than going for maximum realism.
Pixel art is another example. These designs deliberately focus on pixels, and often use an extremely limited colour palette too.