Aliasing: should you be concerned about jaggies?

The term ‘aliasing’ is a general term applied to signal processing. It refers to an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled. In imaging, it’s often observed as ‘jaggies’, which appear as steps along what should be a continuous line or edge. These are caused by pixel structure. Aliasing can also produce moire, when fine lines appear to ripple due to the interference.