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Unlike Google and Yandex, DuckDuckGo does not store information about your requests either in your computer or on your server.In addition, DuckDuckGo works on a secure HTTPS protocol, So that curious sniffers do not recognize your traffic. On the outcome of the issue, DuckDuckGo will send you to the version of the site with an encrypted page (if there is one).
After Snowden's scandal with total Internet control, this search engine jumped in popularity and is actively developing.
