How to get space ID?

I'm a newcomer to the cryptocurrency world and I've been hearing a lot about space IDs lately. Could you please explain in simple terms what a space ID is and how can I acquire one? I've read about it in some forums but the information is quite scattered and I'm still not sure how to proceed. Is it related to a specific blockchain? Do I need to have a certain amount of cryptocurrency to get one? Or is there a specific platform or service that I should use? Any guidance you could provide would be greatly appreciated.