Protecting cells in the sheet means that the contents of cells cannot be changed and/or formulas can be hidden from view.
To protect cells in the sheet:
Step 1: Locking the cells:
1. Press Ctrl+1 and select the Protection tab in the Format Cells dialog box.
2. Select the Locked checkbox and click OK.
Step 2: Protect a sheet:
Select Review - Protect Sheet (in Changes Group)
1. Select the sheet tab, right click and select Protect Sheet.
2. Enter a password and click OK.
Screenshot // Protecting Cells in the Sheet in Excel 2007
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