Password protect and completely hide worksheets in Excel in order to protect sensitive data, like source data, pivot table data, etc.
This tip helps a lot when you send big workbooks to coworkers and only want them to focus on specific worksheets.
This requires no coding, no vba or macros, and it allows you to keep important worksheets and data safe so that they can't be easily changed and messed up while you keep other front-facing worksheets visible and usable.
Protect Excel Data (Microsoft)