What does h mean in vertex form?

Excuse me, could you please clarify what "h" stands for in the context of vertex form? I'm a bit unfamiliar with this particular terminology and would appreciate it if you could provide a brief explanation. Is it a variable that represents a specific point on the graph, perhaps the horizontal position of the vertex? Or does it have a different meaning entirely? I'm eager to learn more about this and understand how it fits into the overall concept of vertex form.