Published many tutorial articles of selenium IDE related to verification commands with examples. "verifySelectedValue" and "verifySelectedValues" are verification commands and useful to verify the selection of values from list box or drop down of your software web application."verifySelectedValue" commandworks with single selection from list box and "verifySelectedValues" works with multiple selection from list box.
"verifySelectedValue" command facilitate selenium ide to verify single selection from list box. It will check value attribute of selected value and verify that is it match with expected value? Pass if Yes. Else return error like '[error] Actual value 'India' did not match 'Germany''.
"verifySelectedValues" will works same as "verifySelectedValue" command but you can use it for single or multiple selections too. It will pass if match found. Else it will send error message like '[error] Actual value 'India,Germany' did not match 'India''
Look in to above given example. I have used both commands 2 time. 1st command from both will fail and 2nd will pass. Run this test case in your selenium IDE for better understanding. Both commands are just verification commands so it will not stop selenium ide execution even if any of them will fail.