The wikipedia article on Step up converters says
A boost converter (step-up converter) is a DC-to-DC power converter with an output voltage greater than its input voltage.
However if I look at any given step up converter it will mention that the input and output is AC. Why this discrepancy? I hope and guess it's just a terminology thing, but the concept of an AC step-up converter is something I have a lot of trouble understanding, so I would like to have my terminology right.