The letters in the heading above a worksheet grid are called column names.
The numbers in the heading to the left of a worksheet grid are called row names.
The grid is a worksheet and is created by gridlines.
OK. You answered your own question.
When you look at a worksheet in Excel you can see all the cells, because of the lines around them. Those are gridlines. You can also add borders, to make heavier lines around cells. Gridlines can be turned off completely, by going to the Options menu and the View section and removing the tick beside Gridlines.
The Formula Bar.
Column heading
When you look at a worksheet and see the rows and columns and cells, it is the gridlines that form the grid. Without them the cells would still be there, but your sheet would look blank.
A worksheet. Some people may also refer to a table, which would be a specific rectangular set of cells within a worksheet used for a particular purpose.
A worksheet contains columns, rows and cells and is where you do your work. Each worksheet has a name. You can have more than one worksheet in a workbook. Each worksheet has a tab at the bottom of the screen, with its name on it. This is a sheet tab. It allows you to identify the different worksheets and by clicking on a sheet tab, you can change from one worksheet to another.
If you have Excel 2007 or higher, click the shape or object in the worksheet. In Drawing Tools on the Format tab, in the Arrange group, click Align. Then, to position shapes or objects to the closest intersection of the grid, click Snap to Grid or to position shapes or objects to grid lines that go through the vertical and horizontal edges of other shapes or objects, click Snap to Shape.
The Worksheet is the grid of cells, in columns and rows, where you input your data. A chart is a simplified visualization of the data which was entered on the grid.
Initially you will see a splash screen showing the name of the application, in this case Excel. That appears as Excel loads. When Excel has finished loading, you will see a blank worksheet, which is a grid of columns headed by letters and rows headed by numbers. The Sheet will initially be called Sheet1 and the document will be Book1.