Question

what is data series -- a component of chart in OpenOffice.calc​

Answer 1

To create a chart, first highlight (select) the data to be included in the chart. The selection does not need to be in a single block, as shown below; you can also choose individual cells or groups of cells (columns or rows). See Introducing Calc for more about selecting cells and ranges of cells.

I hope you understand

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Answer 2

If you create your own chart, you can usually remember what data it came from. But what if there's a whole bunch of different data sets in the sheet; if there are many sheets in the spreadsheet; or if you just got a spreadsheet from someone who left the company to go teach yoga in Aruba and you have no idea what the spreadsheet is about?

Here's your spreadsheet and a chart. The person who created it didn't have the courtesy to even use the headings of the data in the chart so you've got no info about what the info is.