Disclosure – I have never used semrush so if it’s a question specific to theirs, I may be wrong.
In short, databases have objects which are like spreadsheets. Each spreadsheet stores and organizes information in a certain way so it makes sense (contacts on the contact spreadsheet, etc). How these objects (spreadsheets) interact with one another is called a schema. It’s like the blueprint for a big database so you can see what goes where.
To document the ways they interact, you use markup. It’s a way to show relationships and hierarchy between the objects. You can have many types of relationships like one-to-one, one-to-many, and parent-child. All have different rules.
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