A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
This is a shortcut command of "Select Current WorkSheet and Next WorkSheet". As after you have pressed this shortcut key, Excel Selects the Current WorkSheet and Next Worksheet and waiting for your next commands (like, Sheet Tab Color, Delete, Hide, Rename etc.). You may notice that, the Workbook also marked as "... [Group]".
To Deselect these WorkSheets again, you can simply press Ctrl+Shift+Page Up or Right Click on the Sheet Tab and Click on "Ungroup Sheets".