How do I keep source data private in microsoft excel?

I have a workbook that I need to forward. It has several sheets of data but I want the email recipiant to only be able to see one sheet and not to be able to view the rest of the workbook. How do I keep the recipiant from fishing for my source data? Much Thanks!How do I keep source data private in microsoft excel?
Password protect each sheet you want to protect, hide those sheets, then password protect the sheet you are sharing and hide the formulas.