I've been using DuckDuckGo for years, and I have it installed as my default search engine on every browser I use.  In the Chromium-based browsers, I also have the DuckDuckGo Privacy Essentials extension installed.

To my knowledge, there is no DuckDuckGo Browser for the PC platform.  They have introduced one for Android, though:  DuckDuckGo Privacy Browser for Android.  All of the sites talking about using this for Windows end up talking about using an Android Emulator to run it, which is way more trouble than it's worth since.

In the PC world, it's a search engine and/or browser extension, but not a full-blown web browser.
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Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363  

The purpose of education is not to validate ignorance but to overcome it.
       ~ Lawrence Krauss