What's the difference between getActiveRange() and getSelection()?

Question

It seems like they both do the same thing, which is returning the selected range in an active "opened" sheet. What am I missing here? Are there cases where you need to use getSelection()?

var sheet = SpreadsheetApp.getActiveSheet();
var range = sheet.getActiveRange();    
var selection = sheet.getSelection();

// These return the same values
Logger.log("Range Values: %s", range.getValues());
Logger.log("Selection Values: %s", selection.getActiveRange().getValues());

// These also return the same values
Logger.log("Sheet Current Cell: %s", sheet.getCurrentCell().getValue());
Logger.log("Selection Current Cell: %s", selection.getCurrentCell().getValue());

Answer 1

According to the documentation, there is a difference.

getActiveRange() returns the Class Range, but getSelection() returns the Class Selection. The difference being that a selection can be non-adjacent ranges.

So, if you need to get selected non-adjacent ranges, then you'd need to use getSelection() A range can only be a "group of adjacent cells in a sheet"