Active Sheet –

Definition:
The active sheet is the worksheet in a workbook that is currently open and ready for editing. When you’re working in a multi-sheet workbook, only one sheet can be active at a time.

Key Characteristics:

• Visual Indicator:
  The tab of the active sheet is typically highlighted or shown in bold to help you easily identify which sheet you’re working on.
• User Interaction:
  Any data you enter, formulas you apply, or formatting you change will apply only to the active sheet, unless you specifically select multiple sheets (called grouped sheets).
• Navigation:
  You can switch the active sheet by clicking on a different sheet tab at the bottom of the workbook window. Alternatively, you can use keyboard shortcuts (e.g., Ctrl + Page Up/Page Down in Excel) to move between sheets.
• Programmatic Use (in VBA or Scripts):
  In programming contexts like Excel VBA or Google Apps Script, the active sheet is often referenced by default in macros or functions. For example, in VBA:

  ActiveSheet.Range("A1").Value = "Hello"
  

  This puts “Hello” in cell A1 of the currently active sheet.