What is a Dataset?
A dataset (or data set) is a collection of data. This data can be formatted in multiple ways, and in a tabular structure will correspond to one or more tables. Tables are typically structured to contain columns and rows, with columns corresponding to variables or keys, and the rows corresponding to records or values.
https://www.usgs.gov/faqs/what-are-differences-between-data-dataset-and-database
https://www.ibm.com/docs/en/zos-basic-skills?topic=more-what-is-data-set