Difference between hex IDs and int IDs

I am new to using GraphQL queries to get information out of ZenHub. I would like to know the difference between the hexadecimal IDs and the integer IDs. Some queries want the hex ID and some want the integer ID. Is there a standard way to find both IDs for repos, workspaces, and issues?


I am referring to the ZenHub API documentation to understand which endpoints and queries require hexadecimal IDs (node IDs) and which require integer IDs. The documentation should provide clear guidance on this distinction.