This document has changes that are not saved. Opening another document replaces it.
A CSV or JSON file becomes a dataset in this document: typed columns (numbers, dates, text), ready for formulas and charts.
Published statistics you may share in a document, with the source credited: interest and mortgage rates, inflation, share price indices, house prices.
Open data imports well: the Bank of England database, ONS time series, OECD, HM Land Registry. folio keeps a copy in the document (it still opens offline) and records where and when it came from.