This Excel 2003 tutorial includes everything you need to know to get started with Microsoft Excel.
An Excel worksheet is made up of columns and rows. Where these columns and rows intersect, they form little boxes called cells. The active cell, or the cell that can be acted upon, reveals a dark border. All other cells reveal a light gray border. Each cell has a name. Its name is comprised of two parts: the column letter and the row number.
In the picture below, cell C3—formed by the intersection of column C and row 3—contains a dark border. It is the active cell.