The story
Most English interrogative words start with wh-, for example, who, whom, whose, what, which, when, where, why, etc. (though how is an exception).
Etymology from Wiktionary, CC BY-SA 4.0.
wh-movement
Today it means: a syntactic phenomenon found in many languages around the world, in which interrogative words (sometimes called wh-words) or phrases show a special word order. Unlike ordinary phrases, such wh-words appear at the beginning of an interrogative clause. Full definition →