Описание тега worksheet
Worksheet is an Excel worksheet. It consists of cells filled with data. Choose this tag if the problem you have involves working with the Worksheet object.
If you use this tag, you probably should also use Excel and VBA (or the language you use) tags.
According to Wikipedia article, a worksheet is a sheet of paper, or on a computer, on which problems are worked.
Worksheets in Excel are very powerful but simple and convenient objects that can be used in a plenty of ways. They became de-facto industrial and business standard. For example, credit plan sheets are usually developed in Excel worksheets.
Also, they are used in science and education for the ability to be combined with diagrams and charts, which can also be accessed through Sheets object.
Worksheet has underlying programming object of the same name which has access to all of it's built-in features and functions.