The borders tool
Since Microsoft Excel 2007, the amount of lines has been 1,048,576.
Little moving lines which are referred to as marching ants.
Rows and Columns and the "boxes" are called cells
Excel does not use leader lines, because it does not use tabs. You would find leader lines in MS Word.
The horizantal lines
the lines between cells
The actual lines are known as gridlines, both vertical and horizontal. A vertical line of cells is known as a row.
Press Alt-Enter while in the formula editing window at the top of the page to add an addtional line within a cell.
3
Grid lines.
When using Ctrl F in Excel, the 'found' cell is outlined in a green line - it is very hard to see if the cells already have border lines.
parallel lines are diagonal lines or increasing lines