WordPress Themes Developer Interview Question:

Please explain why widget does not show up in the sidebar?

Submitted by: Muhammad

While using widget you have to ensure whether your theme supports the widget and if it does then it must show the sidebar. If in any case if it happens that you don't see the sidebar then it might be missing the “function.php” file or file similar to that. This can also happen if you have forgot to save the changes in the widget or refreshing the older display of the page.
Submitted by: Muhammad