protect sheet tool vs save as option password protect

Please explain the difference between the two choices in LibreCalc Tool option, “protect sheet” and save as option “password protect” I don’t know what else to add. The tool is a drop down option within the document/spreadsheet and the other is a check box that appears when one saves/ saves as the document/spreadheet.

The difference between the two options in the LibreCalc Tool option, “protect sheet” = only the spreadsheet is protected, and save with option “protect with password” = the file is only opened if you know the password, is encrypted.

Thank you.