Imagine you have a box of toys (a "collection"). The For Each loop is like saying:

"For every toy in this box, I want to do something with it (like inspect it, put it on a shelf, etc.). Once I've done that something with every single toy in the box, I'm done."

You don't tell it how many times to run. It runs once for each item in a collection (like a box of toys, a range of cells in Excel, etc.). The number of times it runs depends on how many items are in the collection.

Let's say you have some numbers in cells A1 to A5 of your Excel sheet, and you want to double the value of each of these cells using VBA. Here's how you could do it with a For Each loop:

Sub DoubleCellValues()

  Dim cell As Range 'Declare a variable to hold each cell
  Dim myRange As Range

  'Define the range you want to loop through (A1:A5)
  Set myRange = Range("A1:A5")

  'For Each cell in the range...
  For Each cell In myRange
    'Double the value of the cell
    cell.Value = cell.Value * 2
  Next cell 'Move to the next cell in the range

End Sub

The For Each loop is designed to easily process every item in a collection (like a range of cells), without you having to worry about keeping track of indexes or counters. It makes your code cleaner and easier to read when you want to do the same thing to every item in a group.