In web design, a mirror site is a website that duplicates the content of another site, usually to reduce network traffic or make the content more available. ElgooG, however, is a different type of mirror site. ElgooG, which is Google spelled backwards, is a mirror image of the Google website.

Depending on the browser you use, the search box will type from right to left and will usually display results backwards. You can search for words both forwards and backwards, but typing them backwards is more fun.

ElgooG is a parody site originally designed and hosted by All Too Flat, a parody and comedy website. Although elgooG is not affiliated with Google, it is stated in the small print at the bottom of the elgooG search screen, but a search on the Whois website shows that Google is indeed the owner of the site.

Although the site is intended as a joke, it has been maintained for several years and periodically updated to reflect changes in the Google website. Search results in elgooG are pulled from the actual Google search engine and then vice versa.