Worksheet protection is a two-step process: the first step is to unlock cells that others can edit, and then you can protect the worksheet with or without a password. In your Excel file, select the worksheet tab that you want to protect. Tip: You can select multiple, non-contiguous cells by pressing Ctrl+Left-Click. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.