Question

hiding and unhiding row and column,defination​

Answer 1

Hide rows or columns

The remaining six rows are still visible. Normally, row numbers or column labels are separated by a single line. If there is a double line, instead of a single, it means that there are some items hidden. In a similar fashion, you can hide columns. Select columns you want to hide.

Answer 2

in excel you can easily show and hide rows columns and sheets as well this is useful as you may want the data to be included in the sheet however you may not necessarily want all the data available note that this does not delete the data it really hides the column or rows