DuckDuckGo is an internet search engine that offers a more private and secure search experience. It is based on several key technologies, including Ajax, HTML5, CSS3, React, and Node.js. It utilizes a combination of server-side and client-side technologies to deliver a fast and reliable search experience. DuckDuckGo also has its own indexing system, which allows it to quickly and accurately provide search results. Additionally, it relies heavily on open source technologies and has several security features, such as encryption, to protect the user's privacy.