What is Microsoft Excel?
XLSX is the modern Microsoft Excel workbook format and is commonly used in geospatial workflows when the audience wants spreadsheet review more than a native geometry container.
Excel is often where stakeholders review, annotate, and exchange records, so spatial data frequently passes through XLSX even when the long-term working format is a GIS dataset.
A workbook becomes spatially useful only when sheets include coordinates, geometry text, or fields that another tool can interpret as location data.