[bhu1st]

Never thought that specific data is what defines a domain.

Do you have other examples of this or a more elaborate form of explanation to this?

[philomath_mn]

I think they just mean the meaning of the data that comes through, which naturally consitutes the information important to that domain.

I work in fintech, the data points of my domain are transactions, prices, properties of different instruments, etc.

This data is moved + manipulated in different ways using different formats by different systems, but each day I accumulate useful context and expertise on the data of my domain.