To search for a value in Excel, you can use the "Find and Replace" feature. First, select the cell or range of cells that you want to search. Then, click on the "Home" tab and select the "Find and Replace" button. In the "Find and Replace" dialog box, enter the value that you want to find. Then, select the "Find Next" button. Excel will search for the value that you entered and will highlight the cell that it is found in. If you want to replace the value that is found, you can select the "Replace" button.