That might just be my world in which the acronym DFS has a single well defined meaning; but of course the interview question never says "implement DFS", it will

That might just be my world in which the acronym DFS has a single well defined meaning; but of course the interview question never says "implement DFS", it will be a kind-of-real-life coding exercise that can be solved by a graph traversal, like checking if some nested structure has a loop.