This means someone can see everything you've been searching, not just one isolated search.
You can usually find out a lot about a person from their search history.
At Duck Duck Go, our encrypted version goes even further and automatically changes links from a number of major Web sites to point to the encrypted versions of those sites.
It is modeled after (and uses code from) the HTTPS Everywhere Fire Fox add-on.
Another way to prevent search leakage is by using something called a POST request, which has the effect of not showing your search in your browser, and, as a consequence, does not send it to other sites.
When you search at Duck Duck Go, we don't know who you are and there is no way to tie your searches together.
When you access Duck Duck Go (or any Web site), your Web browser automatically sends information about your computer, e.g. Because this information could be used to link you to your searches, we do not log (store) it at all.
The other sites will still know that you visited them, but they will not know what search you entered beforehand.
At some other search engines (including us), you can also use an encrypted version (HTTPS), which as a byproduct doesn't usually send your search terms to sites.