is a text format used for representing tabular data. Each file line is located on a separate line in the table. The values of the columns are separated by a delimiter, most often a comma. However, other symbols can be used as delimiters as well.
XLSX is a file format created with Microsoft Excel, version from 2007 and younger. This file is a spreadsheet. All data distributed document and stored in the cells. Each cell has a unique address, which is denoted by the letters and Arabic numerals. XLSX file format is based on the Open XML. To reduce the size of the file is compressed ZIP.