Informally, the term data often defines a single collection of facts.
The data given in this report is interesting and very convincing. (Informal)
In formal writing, if your emphasis is on the individual facts, data is used as the plural form of the singular datum.
These data were collected during months of research. (Formal, scientific)
(From Write for Business, page 229, and Proofreader's Guide PDF, page 41)
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