Sensational explanation. Thank you.

Bob Phillips wrote:
Sheets refers to the many types of sheets available in a workbook, which
includes worksheets, charts, dialog sheets etc. whereas worksheets only
refer to worksheets, those cellular, grid-like sheets for formulae,
analysis, etc.

Select selects an object, such as a shape, a range, a button, etc. The
selection can be multiple items, such as a range of cells, or a collection
of shapes. Activate is on a single cell, or a single shape, and would be
within the selection. When a cell is activated, it can be all, or part of, a
range of cells.