Excel uses a three stage process to recalculate cells. It first draws a dependency tree, and then lists a calculation chain and then recalculates the cells. Check this link if you are interested in learning more about the recalculation process. Excel determines if a cell’s value depends on another, and decides the order in which they should be recalculated.
Visual Basics for Applications (VBA) allows users to build on the existing functionality of Microsoft Excel. It comes with a strong set of inbuilt functions that are often not readily accessible from Excel’s interface. These functions have to be wrapped inside a user defined function to be usable in Excel. A classic example is the Split function.
Most of us have used the Concatenate() function in Excel. It is a neat function that saves you the trouble of keying in “&” between the range addresses. The only thing that would make this awesome would be the ability to concatenate an entire range. That would be way more useful than having to comma separate each cell that you want to concatenate.