The Financial Industry Business Ontology (FIBO) defines the sets of things that are of interest in financial business applications and the ways that those things can relate to one another. In this way, FIBO can give meaning to any data (e.g., spreadsheets, relational databases, XML documents) that describe the business of finance.
See https://www.investopedia.com/terms/r/real-estate-mortgage-investment-conduit-remic.asp for additional information that we can use to explain the differences.