Is Horizon based in the future?

Excuse me, could you please clarify for me if Horizon is actually situated in the future? I'm a bit confused because the term "Horizon" can have various connotations and I'm trying to understand if it refers to a specific point in time that's yet to come, or if it's more of a metaphorical or conceptual reference. Could you elaborate on that for me, please? It would greatly help me in my understanding of the topic.