Is ZBrush voxel-based?

Excuse me, could you please clarify for me if ZBrush is indeed a voxel-based software? I've heard different opinions on this matter and I'm eager to get a definitive answer. I'm particularly interested in understanding how ZBrush functions in terms of its modeling capabilities and whether or not it leverages voxel technology to achieve its renowned level of detail and flexibility. I would appreciate any insights you can offer on this topic.